Physical Sciences and Mathematics Commons^™

Detection And Determination Of N-Nitrosohexamethyleneimine In Benzenesulfonamide, N-[[(Hexahydro-1-H Azepin-1-Yl)Amino]-Carbonyl]-4 Methyl By Hptlc, Anulfo A. Valdez

Theses

A simple method, by High Performance Thin Layer Chromatography HPTLC), was developed for rapid determination of N-Nitrosohexamethyleneimine in Benzenesulfonamide, N-[((hexahydro-1 H Azepin-1-yl)amino]-Carbonyl]-4 methyl, (Tolazamide). Separation of N-Nitrosohe-xamethyleneimine from a Tolazamide solution in chloroform was obtained by precipitation of Tolazamide with n-heptane and by passing the resulting clear solution through a small silica column which was eluted with methanol.

Determination of the N-nitroso compound was achieved by ultraviolet irradiation of it on activated High Performance Silica Gel Plates. Detection was performed by spraying the plates with triethylamine and fluorescamine reagent giving a fluorescent product. Visual detection limits of 25 ppb were …

Synthesis Of Strained Bridgehead Lactams, Quansing Tu

Theses

While 1-Azabicyclo(3,3,1)nonan-2-one was originally thought to be difficult to synthesize, two different methods (DCC and di-n-butyltin oxide) will produce it with high yield. DCC is a strong reagent for absorbing water; the di-n-butyltin oxide method uses a Dean-Stark to remove water and is very useful. Bredt's rule influences the synthesis and stability of the N-bridgehead bicyclic lactams, this is apparent in the lactam series in the behavior of the (2,2,2) compounds and the (3,2,1) compound which we tried unsuccessfully to synthesize.

Oxidation Of N,N-Dimethylformamide And N,N-Dimethylacetamide In A Photoreactor, Su-Jen Syu

Theses

Oxidation of N,N-dimethylformamide(DMF) and N,N-dimethylacetamide(DMA) was investigated in a 30 liter semi-batch reactor. Five reaction processes were studied by using UV alone, O₃ alone, O₂/UV, O₂/O₃/UV and H2 O₂/UV respectively. Mathematical models have been developed to interpret the reaction kinetics. Reaction rate constants and mass transfer coefficients were determined by using Rosenbrock Hillclimb optimization algorithm. The experimental data and the predicted results from the models were compared. The kinetic parameters obtained from the previous semi-batch modes were applied to the continuous stirred tank reactor (CSTR) system. Results of this work show …

Reaction Of Atomic Hydrogen With Chloroform In A Discharge Flow Reactor, Wan-Kuen Jo

Theses

The reactions of atomic hydrogen with chloroform were studied in a tubular flow reactor both in a 4 cm i.d. and 2.6 i.d. discharge flow reactor at pressure of 2.22 to 2.82 mmHg and room temperature using GC and GC/MS for analysis of the reaction. The hydrogen atom concentration at the reaction flame was measured by Chemiluminescence titration with nitrogen dioxide. The hydrogen concentrations are in the 2.48 x 10⁺¹⁴ to 4.83 x 10⁺¹⁴ atoms/cc range at six different hydrogen flow rates. Evidence was found for the formation of atomic carbon intermediate in the reaction, but methane was …

Quantitative Evaluation Of Substituent Effects On Stabilization Energies Of Strained And Unsaturated Molecules, Tyler Arthur Stevenson

Theses

Thermodynamic stabilization energies are presented for a series of monosubstituted vinyl, cyclopropyl, ethynyl, and phenyl compounds. The energies are calculated using ab initio molecular orbital calculations at the 4-31G level, and also with published experimental heat of formation data. Correlation analyses are then attempted with the dual substituent parameter approach with the stabilization energies. The analyses are also attempted with a triple-parameter approach using Topsom's theoretically calculated X, F, and Ro constants. Among the findings are the facts that π-donating substituents correlate well, while π-accepting substituents do not. Indications of the relative sensitivities of hydrocarbon frameworks to substituent electrostatic and …

Synthesis Of Cyclobutenyl Ketals, Atef Z. Boulos

Theses

A series of dialkoxy derivatives of N,N'-di-tert-butyl-2-butylamino-3,3-dichloro-4-dichloromethylene cyclobutenyl carboxamidinum chloride, were prepared by dissolving either Na+ or K+ alkoxide in the appropriate alcohol, or by treatment with potassium hydroxide in the appropriate alcohols. Thus, the dimethoxy, diethoxy, di-isopropoxy, di-n-butoxy, di-tertbutoxy derivatives were obtained.

Transient Phenomena Of Polymer : Aniline-Formaldehyde Fiber And Copolymer Aniline-Phenol-Formaldehyde Fiber, Ing-On Vibulbhan-Watts

Theses

The rotational viscometer which had a uniform stress, designed by Dr. W. Philippoff was used for measuring the viscosities of 6% L-200 in PRIMOL 355 and Lekutherm x-30. Viscosities of 6% L-200 in PRIMOL 355 (polyisobutylene) was measured to check the change of material that was left in the visometer for almost two years. The result showed that the new viscosities are higher than the older results.