Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Law (2840)
- Physical Sciences and Mathematics (2647)
- Social and Behavioral Sciences (1799)
- Education (1426)
- Arts and Humanities (1089)
-
- Engineering (720)
- Life Sciences (640)
- Medicine and Health Sciences (624)
- Environmental Sciences (568)
- Higher Education (544)
- Physics (470)
- Business (463)
- Computer Sciences (436)
- History (360)
- Communication (339)
- Chemistry (333)
- Earth Sciences (296)
- Sociology (287)
- Psychology (283)
- Religion (280)
- Science and Mathematics Education (236)
- Mathematics (233)
- Public Affairs, Public Policy and Public Administration (233)
- International Law (189)
- Mass Communication (186)
- Journalism Studies (182)
- Electrical and Computer Engineering (177)
- Educational Administration and Supervision (165)
- Library and Information Science (157)
- Constitutional Law (149)
- Institution
-
- University of Nebraska - Lincoln (911)
- University of Montana (425)
- Brigham Young University Law School (361)
- University of Mississippi (344)
- University of South Florida (327)
-
- Utah State University (293)
- University of North Dakota (274)
- TÜBİTAK (256)
- Louisiana State University (253)
- West Virginia University (248)
- University of New Hampshire (245)
- University of Northern Iowa (245)
- Eastern Illinois University (239)
- California Polytechnic State University, San Luis Obispo (232)
- Rochester Institute of Technology (188)
- Missouri University of Science and Technology (184)
- Brigham Young University (183)
- California State University, San Bernardino (182)
- Virginia Commonwealth University (175)
- San Jose State University (171)
- Old Dominion University (160)
- University of Dayton (152)
- Western Michigan University (147)
- Portland State University (142)
- University of New Mexico (134)
- University of Central Florida (133)
- Nova Southeastern University (132)
- Marshall University (131)
- University of Nevada, Las Vegas (131)
- University of Malaya (127)
- Keyword
-
- Newspaper (357)
- 2000 (202)
- EIU (133)
- Education (129)
- Eastern Illinois University (114)
-
- Newsletter (112)
- Daily Eastern News (110)
- History (99)
- Spartan Daily (98)
- Bowling Green State University (89)
- College student newspapers and periodicals (83)
- B.G. News (78)
- BG News (78)
- DeafDigest (77)
- News (70)
- Periodicals (69)
- Student newspaper (67)
- Utah State University (67)
- Deaf News (64)
- Student life (63)
- Statesman (62)
- The Utah Statesman (62)
- African-American newspapers, African Americans (61)
- Higher education (60)
- Newspapers (56)
- Student newspapers (56)
- California (54)
- Western Australia (52)
- Internet (51)
- Student (50)
- Publication
-
- Theses and Dissertations (332)
- Faculty Publications (303)
- Theses (250)
- Graduate Theses, Dissertations, and Problem Reports (ETD) (214)
- Utah Court of Appeals Briefs (1996–2006) (172)
-
- LSU Historical Dissertations and Theses (157)
- Utah Supreme Court Briefs (2000–2020) (151)
- Daily Mississippian (all digitized issues) (127)
- Masters Theses (123)
- Graduate Student Theses, Dissertations, & Professional Papers (116)
- Student Works (2000-2009) (113)
- Theses Digitization Project (113)
- Faculty Scholarship (112)
- Articles (105)
- Montana Kaimin, 1898-present (105)
- UNLV Retrospective Theses & Dissertations (102)
- Spartan Daily (School of Journalism and Mass Communications) (98)
- University of Montana Course Syllabi (97)
- Dissertations (96)
- Electronic Theses and Dissertations 2000 - 2009 (94)
- Graduate Research Papers (88)
- The Murray Ledger & Times (83)
- Turkish Journal of Physics (79)
- BG News (Student Newspaper) (78)
- Student Newspapers (77)
- Theses and Graduate Projects (75)
- All ETDs from UAB (73)
- Cal Poly Student Newspaper (73)
- Journal of Electrochemistry (73)
- 2000 Decisions (71)
- Publication Type
- File Type
Articles 17521 - 17550 of 17590
Full-Text Articles in Entire DC Network
The Effect Of Calcination Conditions On The Graphitizability Of Novel Synthetic And Coal-Derived Cokes., Barbara Ellen Bennett
The Effect Of Calcination Conditions On The Graphitizability Of Novel Synthetic And Coal-Derived Cokes., Barbara Ellen Bennett
Graduate Theses, Dissertations, and Problem Reports (ETD)
The effects of calcination heating rate and ultimate calcination temperature upon calcined coke and subsequent graphitic material microstructures were studied for materials prepared from three different precursors. The pitch precursors used were Mitsubishi AR pitch (a synthetic, 100% mesophase pitch), the NMP-extracted portion of a raw coal, and the NMP-extracted fraction of a coal liquefaction residue obtained from an HTI pilot plant. These materials were all green-coked under identical conditions. Optical microscopy confirmed that the Mitsubishi coke was very anisotropic and the HTI coke was nearly as anisotropic. The coke produced from the direct coal extract was very isotropic. Crystalline …
Coming To America: International Students Face A Labyrinth Of Income Tax Issues, Ernest R. Larkins
Coming To America: International Students Face A Labyrinth Of Income Tax Issues, Ernest R. Larkins
Connecticut Journal of International Law
In coming to America, international students provide many benefits to the U.S. educational system. They boost lagging enrollments and bring cultural diversity to American classrooms. When they return to their home countries, international students often take with them a greater appreciation for American culture, traditions, and values. Many times, they act as goodwill ambassadors for the United States. The United States issued 427,000 nonimmigrant visas to academic and vocational students in 1996, an increase of 66 percent over similar visas issued in 1985.' In descending order, Japan, Korea, China, and India accounted for the largest numbers of international students visiting …
A Critical Evaluation Of The Development And Implementation Of Forest Preservation Services, Ryan K. Mckain
A Critical Evaluation Of The Development And Implementation Of Forest Preservation Services, Ryan K. Mckain
Connecticut Journal of International Law
For many years, nations have struggled with loss of the Earth's natural resources. Once thought inexhaustible, animal life, plant life and minerals were exploited as fast as possible. Often viewed as a "race-to- ,,2 the-bottom, nations compete with each other to extract as much of a valuable resource as possible from the planet before the resource vanishes. The prevailing view has not been "use it or lose it" but rather "use it until it's lost." Now our vast resources are being visibly depleted - we can see the bottom of what was historically thought to be a bottomless pit. Recently, …
A Qualitative Analysis Of The Socialization Factors Experienced By Induction Phase Physical Education Teachers From One University., Derek Jason Mohr
A Qualitative Analysis Of The Socialization Factors Experienced By Induction Phase Physical Education Teachers From One University., Derek Jason Mohr
Graduate Theses, Dissertations, and Problem Reports (ETD)
A topic of considerable interest in the educational research community is the process of learning to teach and the role that socialization plays in that process. Numerous educational researchers have focused their attention on examining these processes (e.g., Doyle, 1985; Graham, French, & Woods, 1993; Lawson, 1988; Schempp & Graber, 1992). Recent investigative approaches have attempted to broaden the perspective for viewing and interpreting teacher development, and socialization factors in addition to field experiences and student teaching have been examined (Graham, Hohn, Werner, & Woods, 1993; Widden, Mayer-Smith, & Moon, 1998; Woods & Earls, 1995). The purpose of this study …
A Study Of The Relationship Between The Perceived Leadership Style Of Nursing Chairpersons And The Organizational Climate In Baccalaureate Nursing Programs., Nancy Rowland Mosser
A Study Of The Relationship Between The Perceived Leadership Style Of Nursing Chairpersons And The Organizational Climate In Baccalaureate Nursing Programs., Nancy Rowland Mosser
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study examined the relationship between the leadership frames of nursing chairpersons and the organizational climate of nursing departments as perceived by the nursing faculty. Bolman and Deal's Leadership Orientations Instrument (Other), Borrevik's Organizational Climate Description Questionnaire-Higher Education (Partial), and a demographic questionnaire were sent to 605 nursing faculty members in 60 baccalaureate nursing programs in the American Association of Colleges of Nursing North Atlantic Region. A total of 253 usable responses was returned. Descriptive procedures, Pearson's product moment correlation coefficients, one-way analysis of variance, and the General Linear Models Procedure for analysis of variance were used to analyze the …
Where The Stranger Bides: Resisting America With The Autobiographical Word., Lisa N. Muir
Where The Stranger Bides: Resisting America With The Autobiographical Word., Lisa N. Muir
Graduate Theses, Dissertations, and Problem Reports (ETD)
The recent republication of the works of Anzia Yezierska and Rose Cohen, as well as the first ever publications of the autobiographies of Bella Spewack and Rachel Cohen, demonstrate the current interest in the autobiographical experiences of turn-of-the-century female immigrant writers. These women were not politicos of the Progressive Era, nor were they literary revolutionaries in the stricter sense of writing against a patriarchal literary environment. Instead, these women pay particular attention to how ethnicity was constructed for them by cultural attitudes existing outside the text. Their autobiographical works confirm for the diverse readers of today that ethnicity is not …
Co-Parenting Through Separation And Divorce: Children First
Co-Parenting Through Separation And Divorce: Children First
FS Series – Family Science/HDFS
No abstract provided.
Working It Out: Learning To Negotiate With Your Teenager, Donnarae Jacobson, Marilyn Lesmeister
Working It Out: Learning To Negotiate With Your Teenager, Donnarae Jacobson, Marilyn Lesmeister
FS Series – Family Science/HDFS
No abstract provided.
Paradoxical Interventions With Severe Conduct-Disordered Adolescents: Research Of Treatment Effectiveness., Marsha Anne Mills
Paradoxical Interventions With Severe Conduct-Disordered Adolescents: Research Of Treatment Effectiveness., Marsha Anne Mills
Graduate Theses, Dissertations, and Problem Reports (ETD)
Paradoxical interventions are therapeutic techniques in which the therapist appears to promote the worsening or continuation of the problem rather than its removal. The objective of this treatment is to lessen or eliminate the problematic behavior through the unusual means of encouraging it. Only two previous studies have empirically evaluated these techniques with resistant and defiant youths; those results suggested that paradoxical interventions may be effective with severely conduct-disordered adolescents. This study applied the techniques of symptom scheduling and restraining with three conduct-disordered adolescents residing in a therapeutic group home. The experimental design was a nonconcurrent multiple baseline across participants; …
Disappearing Acts: The State And Violence Against Women In The Twentieth Century, Michelle Fine, Lois Weis
Disappearing Acts: The State And Violence Against Women In The Twentieth Century, Michelle Fine, Lois Weis
Publications and Research
As children we held our breath, our senses filled with the musty smells of elephants, the staccato flashes of twirling plastic flashlights, the terrors of trapeze. With mystery, moustache, and elegance, the magician waved a wand, invited a woman, usually White, seemingly working class, into a box. She disappeared or was cut in half. Applause. Our early introduction to the notion of the sponsored disappearing act. So, too, at the end of the twentieth century, we witness poor and working-class women shoved into spaces too small for human form, no elegance, no wand. And they too disappear. Disappearing from welfare …
Dynamic Behavior Characterization Of Fine Powders Consisting Of A Homogeneous Emulsion, And, Synthesis And Decomposition Of Methane Gas Hydrate: A Reaction Engineering Study., Sridhar Narasimhan
Dynamic Behavior Characterization Of Fine Powders Consisting Of A Homogeneous Emulsion, And, Synthesis And Decomposition Of Methane Gas Hydrate: A Reaction Engineering Study., Sridhar Narasimhan
Graduate Theses, Dissertations, and Problem Reports (ETD)
This work quantitatively characterizes the flow and mixing properties of aerated bulk fine powders between the minimum fluidization and minimum bubbling velocities (Umf < U < Umb). In order to accomplish this characterization, the viscosity of the emulsion phase was measured using the Maxwell’s model for the rheological behavior of complex bodies along with the set of rheological parameters proposed by Kono et al (1994). A unique property of the bulk fine powder called the relaxation time (t) was measured experimentally and this property was combined with another rheological parameter called the plastic deformation coefficient (Y) to give the viscosity of the emulsion phase as m = Yt. SECTION II This work describes the first homogeneous formation and decomposition of methane gas hydrates within several different synthetic sediments by using a highpressure batch reaction system. The pressure of the formation reaction was varied in the range of 6.8 – 13.6 MPa while the temperature was maintained constant at 273.5 K Decomposition of hydrate was accomplished through controlled depressurization starting at a pressure of 2.7 MPa, maintaining the temperature constant at 273.5 K. Overall reaction order, both for the formation and decomposition were also determined.
The Effects Of Supported Employment Level On The Psychosocial Experiences Of Integrated Workers With Mental Retardation., Jennifer L. Schwartz-Mitchell
The Effects Of Supported Employment Level On The Psychosocial Experiences Of Integrated Workers With Mental Retardation., Jennifer L. Schwartz-Mitchell
Graduate Theses, Dissertations, and Problem Reports (ETD)
Supported employment approaches may have a significant impact on the Psychosocial experiences of workers with mild and moderate mental retardation. The present study examined the influence of supported employment level (i.e., individual vs. group) on the depression, loneliness, and lifestyle satisfaction of employees participating in a vocational rehabilitation program. It was hypothesized that supported employment level differences would be reflected in the dependent variables of depression, loneliness, and lifestyle satisfaction reported by participants (N = 54). Additional predictions were made about relationships between these dependent variables and measures of social support and social skills. Supported employment level differences on depression, …
The Development And Validation Of Science Learning Inventory (Sli): A Conceptual Change Framework., Mehdi Seyedmonir
The Development And Validation Of Science Learning Inventory (Sli): A Conceptual Change Framework., Mehdi Seyedmonir
Graduate Theses, Dissertations, and Problem Reports (ETD)
A multidimensional theoretical model, Conceptual Change Science Learning (CCSL), was developed based on Standard Model of Conceptual Change and Cognitive Reconstruction of Knowledge Model. The model addresses three main components of science learning, namely the learner's conceptual ecology, the message along with its social context, and the cognitive engagement. A learner's conceptual ecology is organized around three clusters, including epistemological beliefs, existing conceptions, and motivation. Learner's cognitive engagement is represented by a continuum from peripheral processing involving shallow cognitive engagement to central processing involving deep cognitive engagement. Through reciprocal, non-sequential interactions of such constructs, the learners' conceptual change is achieved. …
Skeletal Muscle Injury, Fibrosis And Transforming Growth Factor-Beta., Cheryl A. Smith
Skeletal Muscle Injury, Fibrosis And Transforming Growth Factor-Beta., Cheryl A. Smith
Graduate Theses, Dissertations, and Problem Reports (ETD)
Several animal models were assessed for their ability to produce pathology with a potential for developing fibrosis. Pathology was determined using standard histochemical and immunohistochemical techniques. In a model of ethanol-induced myopathy, cytochrome p450 1A1/2 was induced in endothelial cells (i.e. capillaries) but there was insufficient pathology to produce fibrosis. Two models of overload, tenotomy of the gastrocnemius muscle and a tetanus toxin overload model showed morphological changes including: degenerating fibers, central nuclei, variable myofiber sizes, and an expansion of the extracellular matrix, but changes were non-uniformly distributed making this a poor fibrosis model. A tetanus-toxin model of repetitive strain …
Secession, War And Rebirth: The Civil War In West Virginia's South Branch Valley Of The Potomac., Stephen Garth Smith
Secession, War And Rebirth: The Civil War In West Virginia's South Branch Valley Of The Potomac., Stephen Garth Smith
Graduate Theses, Dissertations, and Problem Reports (ETD)
West Virginia's South Branch Valley of the Potomac River played a crucial, but little studied, role in the American Civil War. Writing of the August 7, 1864, Battle of Moorefield, historian Robert K. Krick has noted that it “has received far less attention than it deserves.†In this work, it will be demonstrated that not only the August 7, 1864, Battle of Moorefield, but the conflict in the region in general is deserving of in-depth study. The geographic location and the plantation culture of the South Branch Valley favored its political and economic connection to Confederate eastern Virginia. Nevertheless, with …
The Numerical Simulation Of The Flow Of An Injected Grout In Underground Room And Pillar Coal Mines., James Mark Stiles
The Numerical Simulation Of The Flow Of An Injected Grout In Underground Room And Pillar Coal Mines., James Mark Stiles
Graduate Theses, Dissertations, and Problem Reports (ETD)
This research was conducted to develop a computer program, Groutnet , to simulate the flow of a grout injected in a room and pillar coal mine. Previous rheological investigations have demonstrated that grouts composed largely of coal ash and water are Bingham fluids. Because the simulation of a large scale grout injection operation by solving the three dimensional equations of motion would be prohibitively expensive, the equations of motion were integrated in the vertical direction, and the unsteady and convective acceleration terms in the momentum equations were neglected. In order to achieve a closed set of equations, a uniform flow …
Part 1. Structure, Stability And Reactivity Of Small Organic Sulfinic And Sulfonic Acids: Toxicological Implications. Part 2. Role Of Charge Transfer Complexes In Oxidative Cleavage Of Benzpinacols By Iron(Iii) Trisphenanthroline., Serge Alex Svarovsky
Graduate Theses, Dissertations, and Problem Reports (ETD)
Part 1. Structure, stability, and mechanisms of oxidation and hydrolysis of a number of thiourea-S-oxides (thiourea dioxide; N-methylthiourea dioxide; N,N′-dimethylthiourea dioxide; thiourea and N,N′-dimethylthiourea trioxides; and sodium hydroxymethanesulfinate) have been investigated by means of UV-VIS, stopped-flow; X-ray crystallography; molecular calculations; ESR; NMR; and oxygen consumption studies. It was found that oxidation of thioureas does not always proceed through the generally accepted successive addition of oxygen atom to the sulfur center. Instead, thiourea dioxides appear to be the major end product in these oxidations. Mechanism of hydrolysis of thiourea dioxides in basic media reveals complex chemical kinetics which involves initial heterolytic …
Strategic Verbal Aggression: Attacking The Self-Concept To Enhance Motivation In The Classroom., Alan D. Heisel
Strategic Verbal Aggression: Attacking The Self-Concept To Enhance Motivation In The Classroom., Alan D. Heisel
Graduate Theses, Dissertations, and Problem Reports (ETD)
Numerous studies have identified a variety of negative consequences associated with the use of verbal aggression. This study examines the impact of verbal aggression in the instructional context as strategic verbal aggression. A self-report survey of 552 students enrolled in basic communication courses at West Virginia University was collected. Participants received measures reflecting the teacher's immediacy, competence, character, and perceived caring, as well as indices of the participants' argumentativeness, self-esteem, verbal aggressiveness, and Machiavellianism. Each Participant received a scenario reflecting either high/low intensity verbal aggression or high/low intensity no verbal aggression. Finally, participants were asked to evaluate the appropriateness, future …
Developing A West Virginia Child Care Director's Credential: Identifying The Knowledge, Skills, And Issues., Cathy Ruth Jones
Developing A West Virginia Child Care Director's Credential: Identifying The Knowledge, Skills, And Issues., Cathy Ruth Jones
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to establish a baseline of information about West Virginia child care center directors: their knowledge, skill and experience in early care and education, their training needs, what these directors perceive as important knowledge and skill to competently perform their job duties, and their opinions about the development of a director credential. The total population of 265 directors of licensed child care centers were surveyed. In addition, five individual ethnographic interviews broadened and enriched the data gathered from the survey and allowed the respondents to provide their own interpretations of the positions they hold. The …
The Roles Of Cognitive Rigidity And Impulsivity In Adolescent Suicide Attempts., Robin Vaughan Eliason
The Roles Of Cognitive Rigidity And Impulsivity In Adolescent Suicide Attempts., Robin Vaughan Eliason
Graduate Theses, Dissertations, and Problem Reports (ETD)
Suicide is a major health problem for adolescents. It is the sixth leading cause of death for five to 14 year-olds and the first and the third leading cause of death for adolescents 15 to 19 years of age. The purpose of this study was to extend the research on the risk factors of cognitively rigid behavior, impulsive behavior, and depression and to lay groundwork for the validation of cognitively rigid and impulsive personality traits of adolescent suicide attempters. The amount of time between thought and attempt was explored to extend the research on impulsivity. In this three-group design adolescent …
Analysis Of Paramagnetic Point Defects In Potassium Dihydrogen Phosphate And Potassium Titanyl Phosphate Crystals., Nelson Yovanny Garces
Analysis Of Paramagnetic Point Defects In Potassium Dihydrogen Phosphate And Potassium Titanyl Phosphate Crystals., Nelson Yovanny Garces
Graduate Theses, Dissertations, and Problem Reports (ETD)
A series of paramagnetic defects have been characterized in KH2 PO4 (KDP) and KTiOPO4 (KTP) using optical absorption, electron paramagnetic resonance (EPR), and electron-nuclear double resonance (ENDOR) techniques. In KDP, one hole-like center and five electronlike centers were investigated. Spin-Hamiltonian parameters were obtained for the holelike center and two electronlike centers. The hole center consists of a hole trapped on an oxygen ion adjacent to a silicon impurity substituting for a phosphorus ion. The electron centers are oxygen vacancies with one trapped electron, i.e., they are (PO3)2− molecular units. Both the hole center and the electron centers can be formed …
An Examination Of The Multiple Domain Predictor Profiles Of Successful Exercise Behavior In A Health Resort Population., Cheryl Lynn Goldman
An Examination Of The Multiple Domain Predictor Profiles Of Successful Exercise Behavior In A Health Resort Population., Cheryl Lynn Goldman
Graduate Theses, Dissertations, and Problem Reports (ETD)
The present study examined the multiple domain predictor profiles of successful exercise behavior in a health resort population. Successful exercise behavior is operationally defined as maintaining, or changing from a sedentary or somewhat sedentary lifestyle to, an engagement in physical activity at least three times a week for at least twenty minutes each bout (ACSM, 1983). Demographic information, physiological variables, health status and risk factors were assessed at baseline from a sample of repeat guests from a southwestern health and fitness resort. A number of independent variables from each of the three domains were assessed for their ability to predict …
Violence In Schools: Expanding The Dialogue, Stephanie Urso Spina
Violence In Schools: Expanding The Dialogue, Stephanie Urso Spina
Publications and Research
Introductory chapter to Smoke and Mirrors: The Hidden Context of Violence in Schools and Society, edited by Stephanie Urso Spina, Ph.D., published by Rowman & Littlefield in 2000 and is, unfortunately, still timely today.
The Metamorphosis Of Jewish Identities In Nineteenth Century Russia, 1801-1894., James Russell Weiss
The Metamorphosis Of Jewish Identities In Nineteenth Century Russia, 1801-1894., James Russell Weiss
Graduate Theses, Dissertations, and Problem Reports (ETD)
During the period between the ascension of Tsar Alexander I and Tsar Nicholas II, the Jews of Russia and Russian officials were engaged in a curious partnership. Both parties were concerned with determining the precise definition of Jewishness and how this would change during the course of the nineteenth century. Russian officials, in the main, wanted to refashion the Jews of Russia into Russophiles imbued with Russian mores and education but, on no account, were these "new Jews" to be considered true Russians since God had made them a distinct group from their Slavic neighbors. Being compelled to be a …
Educators' Views Of Implementing Direct Instruction Curricula: Connections To Students With Disabilities., Brenda Wilson
Educators' Views Of Implementing Direct Instruction Curricula: Connections To Students With Disabilities., Brenda Wilson
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to examine the process of the first year of implementation of Direct Instruction curricula as seen through the eyes of the educators implementing it. The study also attempted to determine if general educators' knowledge and use of Direct Instruction techniques while implementing a published curriculum would translate into more effective practices toward students with disabilities in the general education classroom. Seventeen teachers at a small rural elementary school were studied as they implemented Direct Instruction curricula for the first time. The teachers used the Reading Mastery, Corrective Reading and Language for Learning programs published …
Biological Control Of Leafy Spurge: A Comprehensive, Easy-To-Read Manual On How To Use Biological Control As An Effective Leafy Spurge Management Tool
Leafy Spurge Database
No abstract provided.
Impediments To Controlling Leafy Spurge In The Northern Great Plains, Randall S. Sell, Dean Bangsund, F. Larry Leistritz
Impediments To Controlling Leafy Spurge In The Northern Great Plains, Randall S. Sell, Dean Bangsund, F. Larry Leistritz
Leafy Spurge Database
No abstract provided.
Effects Of Nitrogen Fertilization In Leafy Spurge Root Architecture, Kirstin Ringwall, Mario E. Biondini, Carolyne E. Grygiel
Effects Of Nitrogen Fertilization In Leafy Spurge Root Architecture, Kirstin Ringwall, Mario E. Biondini, Carolyne E. Grygiel
Leafy Spurge Database
No abstract provided.
Cyclizations Of Enyne-Allenes To Form Persistent Biradicals And Polycyclic Aromatic Hydrocarbons With Carbon Frameworks Represented On The Surface Of Carbon-60., Hai-Ren Zhang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Thermolysis of 1,1′-(1,2-ethynediyl)bis[9-bis(4- tert-butyl)phenyl]ethenylidene-9H-fluorene (benzoenyne-allene) in 1,4-cyclohexadiene (1,4-CHD) at 75°C produced the cycloaromatized adduct 8,16-bis[bis(4-tert-butyl)phenyl]methyldiindeno[1,2,3- hi:1′,2′,3′ -qr]chrysene in 22% yield. The reaction presumably proceeds through a cascade sequence involving an initial Myers cyclization reaction to form a biradical having an α,3-didehydrotoluene moiety in its structure. The subsequent trapping of the aryl radical center in this initially formed biradical with the tetraarylallenic moiety intramolecularly affords a biradical having two stabilized triarylmethyl radical centers. A subsequent hydrogen-atom abstraction from 1,4-CHD, manifesting its radical character, then produces 8,16-bis[bis(4-tert-butyl)phenyl]methyldiindeno[1,2,3- hi:1′,2′,3′ -qr]chrysene. Similarly, thermolysis of 9-diarylethenylidene-1-phenylethynyl- 9H-fluorenes in 1,4-CHD furnished 1-diarylmethyl-2-phenylfluoranthenes in essentially quantitative yields. …
Invasive Plant Species, Barbara H. Mullin