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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Calculation Of Mono-Cyclic Molecular Structures Using Mindo/3, Peter Mark Felker
Calculation Of Mono-Cyclic Molecular Structures Using Mindo/3, Peter Mark Felker
Honors Theses
Molecular geometries of selected, small cyclic compounds were calculated using the semi-epirical, S.C.F. molecular orbital method MINDO/3. Calculated geometries are compared with experiemental values to determine MINDO/3's effectiveness. It is found that the method has several systematic deficiencies. In Particular, carbon-oxygen single bond distances are calculated to be too short.
Examination Of The Acid Etching Process Used In Preventative Dentistry, Robert Charles Morgan
Examination Of The Acid Etching Process Used In Preventative Dentistry, Robert Charles Morgan
Honors Theses
Nuva-Seal is a bisphenol-A-glycidyl-methacrylate monomer which in its polymerized form seals a tooth to prevent carie formation. Prior to application the tooth surface is pretreated with an etching solution to increase the bond strength. The etchant solution is 50% by weight H3PO4 and 7% by weight Zn0. Previous investigations preformed at Union College have determined qualitatively that a substantial portion of enamel is removed by the acid pretreatment. In addition, an extensive literature search into the development of the etching process was performed in order to validate or repute its usefulness.
Co2 Laser-Induced Decomposition Of Freon 113, Jeffrey Joseph Rusik
Co2 Laser-Induced Decomposition Of Freon 113, Jeffrey Joseph Rusik
Honors Theses
Gasgeous freon 113, or CC12FCC1F2, was irradiated with a continous wave carbon dioxide infared laser. The rat of formation of CF2CC1F, a decomposition product, was monitored using an infared spectrometer. The initial rates or product formation were related to irradiation wavelength and power, and the laser induced reaction was related to pyrolysis decomposition. A computer program which calculates the temperatures in a laser beam is modified and applied to the irradiations performed. It is determined that bi- or triphotonic absorption is occuring and that the laser induced reactions are photocatalyzed. A reaction model is discussed which combines thermal excitation, multiphotonic …
Ozonolysis Of Certain Alpha, Beta-Unsaturated Carbonyl Compounds, Alan Howard Wynn
Ozonolysis Of Certain Alpha, Beta-Unsaturated Carbonyl Compounds, Alan Howard Wynn
Honors Theses
One of the intermediates in the ozonolysis of alkynes is the α carbonyl carbonyl oxide. The Hull rearrangment mechanism suggests that the α carbonyl carbonyl oxide can then rearrange via a rotation and cuclization to an anhydride.
Peroxidase And Senescence, Michael Jay Chaskes
Peroxidase And Senescence, Michael Jay Chaskes
Honors Theses
Kinetin and α, α1 - dipryridyl prevented the rapid decrease of chlorophyll content in oat leaf intact segments senescing in the dark.
Synthesis Of Sterically Hindered Disasters, Richard A. Bankowitz
Synthesis Of Sterically Hindered Disasters, Richard A. Bankowitz
Honors Theses
This thesis examines the synthesis of two sterically hindered diesters, neopentyl glycol dipivaloate and ditert-butyl 2, 2-diethylmalonate. The implications of this hinderance for hydrolysis in basic medium are discussed. The neopentyl glycol diester of 2,2-dimethylpropanoic acid is prepared with little difficulty by reaction of the glycol with the acid chloride in the presence of pyridine. The process gives the desired ester in approximately 66% yield. The preparation of the ditert-butyl ester of diethylmalonic acid is also attempted by means of the acid chloride in the presence of pyridine. Preparation of the diethylmalonyl dichloride using acetonitrile as a solvent in most …
Study Of Cndo/2 For The Prediction Of Geometries Of Phosphorus-Containing Molecules, Mark A. Fraser
Study Of Cndo/2 For The Prediction Of Geometries Of Phosphorus-Containing Molecules, Mark A. Fraser
Honors Theses
The method of CNDO/2 is presently being used to study the mechanisms of hydrolysis of phosphate esters. The question, therefore, arises whether or not CNDO/2 can accurately predict the geometries of phosphorus containing molecules. Using an optimizer adapted from the method of Rosenbrock, 41 compounds were tested.
Kinetic Study Of The Chelate Ligand Unwrapping Reactions Of Sterically Hindered Gold (Iii) Complexes, James W. Thackeray
Kinetic Study Of The Chelate Ligand Unwrapping Reactions Of Sterically Hindered Gold (Iii) Complexes, James W. Thackeray
Honors Theses
The complexes [Au(Et2dien_H)Br]PF6, [AU(Me4dien_H)Br]Pf6, and [Au(Et3dien_H)Br]PF6 have been sunthesized and a kinetic study of their conjugate acids performed. This paper centers on the direct replacement of the tridentate ligang on the complex by bromide ion.
Preparation And Kinetics Of Chloro-1,4,7-Triethyldiethylenetriamine Gold (Iii), Paul Lawrence Sargent
Preparation And Kinetics Of Chloro-1,4,7-Triethyldiethylenetriamine Gold (Iii), Paul Lawrence Sargent
Honors Theses
The square-planar complex has been synthesized and its aqueous solution chemistry investigated. The rate of bromide substitution for chloride has been studied along with the rate of the chelate un-wrapping reaction for the bromo-complex. These results aer compared with work on previously studied gold complexes.