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Full-Text Articles in Physical Sciences and Mathematics
A Study Of The Acid Etch Pretreatment Used With The Nuva-Seal" Dental Process, Judith Ann Komoroski
A Study Of The Acid Etch Pretreatment Used With The Nuva-Seal" Dental Process, Judith Ann Komoroski
Honors Theses
Nuva-Seal, a bisphenol-A-glycidyl-methacrylate polymer, is applied to the occlusal surface of teeth to prevent tooth decay. Before application of the sealant, the enamel surface is etched for one minute by a 50 percent by weight solution of phosphoric acid containing seven percent by weight of zinc oxide. This treatment renders the tooth surface more porous and surface active to insure a strong bond between tooth and sealant. Past studies at Union College have shown that the etching treatment removes much of the enamel from the tooth. In the current work the amount of tooth removed by acid etching was determined …
The Decomposition Of Azibenzil In The Presence Of Oxygen, Nancy C. Westby
The Decomposition Of Azibenzil In The Presence Of Oxygen, Nancy C. Westby
Honors Theses
The ozonolysis of acetylenes is thought to proceed through the formation of ∝-carbonyl carbonyl oxide intermediates. This reaction has been shown to parallel the effect of molecular oxygen on ketocarbenes. Azibenzil, a diazo-ketone, will decompose to a ketocarbene by the action of heat, light or catalyst. The ketocarbene may decompose by two pathways: Wolff rearrangement and non-rearrangement. The Wolff rearrangement route will produce methyldiphenylacetate (upon addition of methanol), benzophenone, tetraphenylglycolide and possibly other high molecular weight polymeric species. The non-rearrangement pathway will presumably produce ∝-carbonyl carbonyl oxides which will decompose under varying circumstances to produce benzyl, benzoic anhydride, benzophenone, tetraphenylglycolide …
The Addition Of Singlet Oxygen To N, N-Diethyl-1-Propynylamine, Kenneth S. Zimmerman
The Addition Of Singlet Oxygen To N, N-Diethyl-1-Propynylamine, Kenneth S. Zimmerman
Honors Theses
The addition of singlet oxygen to N, N-diethyl-1-pro-pynylamine produced 60-75% yields of N, N-diethyl pyruvamide and various carbon dioxide contamination products under several conditions. Products under several conditions. Product formation was independent of solvent and photosensitizer and was shown to proceed via a singlet oxygen addition mechanism with no free radical involvement. The water addition product was also demonstrated to be N, N-diethyl propanamide. A dioxetene intermediate is suggested as the precursor of N, N-diethyl pyruvamide.
The Preparation And Kinetics Of A Sterically Hindered Gold (Iii) Complex, Michael R. Golden
The Preparation And Kinetics Of A Sterically Hindered Gold (Iii) Complex, Michael R. Golden
Honors Theses
The alkyl substituted gold (III) complex [Au(1, 4, 7-Me3dien)Cl] (PF6)2 [where 1, 4, 7-Me3dien respresents (CH3) HNCH2CH2N(CH3)CH2CH2NH(CH3)] has been synthesized. The cation of this compound differs from previously synthesized gold (III) complexes of similar structure since it can form a conjugate base only by loss of hydrogen from a terminal nitrogen. Aqueous solution chemistry studies of this ion reveals that the Cl- is hydrolyzed before loss of a proton from the ligand which is the reverse of the sequence observed with previously studied ions. Monobromo substitution rates are found to be slower than for the complex with no alkyl substitution …
Reactions Of Diazoketones With Neighboring Carbon-To-Carbon Double Bonds, Robert James Perry
Reactions Of Diazoketones With Neighboring Carbon-To-Carbon Double Bonds, Robert James Perry
Honors Theses
It was hoped that the carbon-carbon double bond in an unsaturated diazoketone would act as a nucleophile in an intramolecular attack to give a ring closure. Experimental results indicate that the double bond did participate, but in such a manner so as to give only substituted products, rather than cyclic ones. We suggest a diazonium salt intermediate in the initial formation of these substituted products. Polymerization and oxonium formation after reactopm with a Lewis acid solvent account for the polymers formed and some of the substituted products.
Co2 Laser Induced Decomposition Of Freon 113, Richard S. Herrick
Co2 Laser Induced Decomposition Of Freon 113, Richard S. Herrick
Honors Theses
Irradiations were made on CCl2FCClF2, Freon 113, to see if the resulting decomposition was photochemical in nature. The irradiation source was Molectron 250, continuous wave, infrared laser operating in the single line mode. The wavelength of irradiation was varied over the range 9.473 µ to 9.734 µ. The pressure except one (in which the cell window broke). Relative rates of reaction were calculated for a constant power absorbed by the sample of 7.8 ± 4W. These relative rates were plotted against the irradiation wavelength. This was superimposed on a plot of the IR band for Freon 113 which was irradiated …