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Now showing items 11-20 of 23
Synthesis, characterization, and structure of molybdenum and tungsten trinuclear compounds with more than six cluster electrons
(1992)
Synthetic methods for a series of new M3X13 type triangular trinuclear clusters with eight cluster electrons and a core of M3OX3 (M = Mo, W; X = Cl, Br) are described in this dissertation. The methods employed in the ...
A study of the acetolyses of 2-acetoxyalkyltellurium trihalides
(1992)
The oxidation of alkenes using tellurium tetrachloride is a two step process. The first step has been shown to be the anti addition of tellurium and oxygen across the double bond. This work examines the second step of the ...
Synthesis and efficacy of dibenzofuran-based diacids and amino acids designed to nucleate parallel and antiparallel beta-sheet formation
(1992)
The synthesis of 4,6-dibenzofurandipropionic acid 18 and 4-(N-tertbutyloxycarbonyl-2-aminoethyl-)-6-dibenzofuranpropionic acid 19, designed to nucleate parallel and antiparallel (β-sheet formation respectively, was ...
The selective functionalization of saturated hydrocarbons with GIF-type systems
(1992)
The Gif-family is a group of Fe- or Cu-containing chemical systems oxidizing saturated hydrocarbons to ketones. The unusual behavior shown by these systems (secondary C-H bonds are oxidized preferentially even in the ...
Proton solid-state nuclear magnetic resonance studies of zeolite catalysts
(1992)
Zeolites are inorganic solid acids which arc important in many industrial heterogeneous catalysis processes involving chemical transformations of hydrocarbons. The Bronsted acidity of a particular zeolite determines its ...
Silyl group transfer cyclizations
(1992)
An intermolecular-intramolecular Michael reaction sequence was developed for the synthesis of cyclopentanes and cyclohexanes. Silyl ketene acetals and silyl enol ethers were used as the nucleophilic initiators of the ring ...
Double coincidence studies of molecular dissociation induced by heavy ion impact
(1992)
Multielectron removal from an atom or molecule may be accomplished with high efficiency by the impact of a fast, highly-charged, heavy ion. When a diatomic molecule suffers the loss of electrons, it will generally dissociate ...
Electronic structure and reaction mechanism of transition metal complexes : bond-stretch isomerism, methane activation on transient cyclopentadienylcarbonylrhodium, and ligand substitutions on metal nitrosyl carbonyl complexes
(1992)
Ab initio molecular orbital techniques are utilized to investigate the electronic structure and reaction mechanism of transition metal complexes. Our calculations at the levels of the restricted Hartree-Fock (RHF) and ...
Enzymes in organic synthesis : uses of CMP-sialic acid synthetase, sialic acid aldolase and subtilisin
(1992)
Two of the key enzymes in the biosynthetic pathway of sialic acids were studied. A highly expressed CMP-sialic acid synthetase with a decapeptide tag attached at the C-terminal of the enzyme and the wild type enzyme from ...
Overexpression, purification, and characterization of the Pseudomonas denitrificans and Salmonella typhimurium gene products in vitamin B12 biosynthesis, structural analysis of vitamin B12 intermediates, and enzymatic synthesis of factor S3
(1992)
Some of the Pseudomonas denitrificans cob and the Salmonella typhimurium cbi genes involved in vitamin B12 biosynthesis were overexpressed in the heterologous E. coli system and purified. The functions of P. denitrificans ...