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Full-Text Articles in Chemistry
Synthesis And Studies Of A Carbon-13 Labelled Chemical Carcinogen, Robert E. Royer
Synthesis And Studies Of A Carbon-13 Labelled Chemical Carcinogen, Robert E. Royer
Chemistry and Chemical Biology ETDs
Derivatives of 6-methylbenzo[a]pyrene enriched to 90% carbon-13 at the methyl carbon were synthesized. Reactions of the carcinogen, 6-chloromethylbenzo[a]pyrene, with nucleophiles under solvolytic conditions were studied kinetically and, using labelled 6-chloromethylbenzo[a]pyrene, the reaction products were studied by CMR. The purpose was to characterize the selectivity of the benzo[a]pyrenyl- 6-methyl carbonium ion in its reactions with some simple nucleophiles and with nucleosides and other nucleic acid components.
Although the solvolysis of 6-chloromethylbenzo[a]pyrene in aqueous/organic solution is first order, information about the course of the reaction can be obtained, under certain circumstances, from rate constants. Thus, if the rate of solvolysis is slowed …
Photochemical Studies Of Hydroxo-Bridged Complexes Of Chromium (Iii), Ronald Raymond Ruminski
Photochemical Studies Of Hydroxo-Bridged Complexes Of Chromium (Iii), Ronald Raymond Ruminski
Chemistry and Chemical Biology ETDs
The acid solution and solid state photolysis in both visible and ultraviolet regions of the spectrum for µ-hydroxo-bis[pentaamminechromium(III)] chloride, and the solution photolysis in the visible and 1 traviolet region of the spectrum for µ-hydroxo-bis[pentaarnrninechr rnium(III)] perchlorate, have been studied. The ultraviolet irradiation of µ-hydroxo-bis[pentaamminechromium(III)] chloride in HCl and CHlO4 produces a redox photoproduct identified as HCrO4-, although the rate of production of HCrO4- in HClO4 is slower than in HCl. Photochemical cleavage of the hydroxo-bridge occurs in the ultraviolet photolysis of µ -hydroxo-bis[pentaanuninechromium(III)] chloride and is 1.9 times faster than the corresponding …
The Effects Of Various Pyrolysis Conditions On The Release Of Products From Green River Oil Shale, Georgia Thomas Fritz
The Effects Of Various Pyrolysis Conditions On The Release Of Products From Green River Oil Shale, Georgia Thomas Fritz
Chemistry and Chemical Biology ETDs
The fusion of oil shales with eutectic mixtures of inorganic salts was studied with the objective of finding a chemical means of releasing the organic material either at a lower temperature or with a lower empirical activation energy (Ea). Experimental techniques by which the pyrolysis of oil shale was studied were thermogravimetry (TG), evolved gas detection (EGD), and pyrolysis/thin-layer chromatography (TLC). The following fused salts were investigated (ratios in mo1%): LiCO3/Na2co3/K2CO3, 43.5/31.5/25.0; KSCN/NaSCN, 73.75/26.25; KSCN/NaSCN, 70/30; Na2SO4/K2SO4/ZnSO4, 29.1/30.2/40.7; NaCl/Na2CO3 …
Comparisons Between Oriented Film And Solution Tertiary Structure Of Various Nucleic Acids, Douglas R. C. Priore
Comparisons Between Oriented Film And Solution Tertiary Structure Of Various Nucleic Acids, Douglas R. C. Priore
Chemistry and Chemical Biology ETDs
It was desired to help establish whether or not the tertiary structure of a biomolecule is the same in a crystal (or an oriented film) as it is in solution. Generally it is accepted that the structures in these diverse environments are similar, if not identical. By comparing the extinction coefficients obtained from oriented film data to those obtained from solution data it was hoped that this question might further be resolved. To this end an electric dichroism instrument built in our lab was used to measure the dichroic signal so as to calculate, with the help of the ultraviolet …
Chromium(Iii) Tartrates, Gerald Lynn Robbins
Chromium(Iii) Tartrates, Gerald Lynn Robbins
Chemistry and Chemical Biology ETDs
The binuclear tartrate-bridged complexes [Cr 2 (tartH) 2 (L)2 ] and Na [ Cr2 (tart) (tartH) (L)2]("tart" = C4H2O64-, "tartH" = C4H3O63- and "L"= 1,10-phenanthroline or 2,2'-bipyridyl) have been synthesized where each complex contains either two optically active or two meso bridging ligands. A discussion of the number of isomers and symmetries of these complexes is presented, as well as a complete description of the syntheses of the complexes and their sodium salts.