The synthesis of methyl 3,6-dimethylpyridine-2-carboxylate (192) by the Diels-Alder addition of 3-butene-2-one dimethylhydrazone (190) and methyl-2-butynoate (16) is described. The structure of 192 was confirmed by the synthesis of methyl 2,6-dimethylpyridine-3-carboxylate (195), the opposite regioisomer.The synthesis of methyl 3,5-dimethylpyridine-2-carboxylate (199) from [4+2] cycloaddition of 2-methyl-2-propenal dimethylhydrazone (171) and 16 is described. In addition to producing a small amount of 199 directly, the reaction produced an intermediate of possible structure 198 which yielded 199 on catalytic dehydrogenation.On prolonged heating, 2-acetyl-5-methylpyridine (200) was produced by the reaction of diene 171 with methyl vinyl ketone (176).The preparation of 2-cyan-5-methylpyridine (201) from the tetrahydropyridine derivative 175 via catalytic dehydrogenation is described.The synthesis of 5,7-dioxo-3-methyl-6-phenyl-1,1.,5,6,7-pentahydropyrroloC3,1.-b] pyridine (202) through the Diels-Alder addition of diene 171 and N-phenylmaleimide (149) is described. Also reported is the preparation of 5,7-dioxo-3-methyl-6-phenyl-3,5,6-trihydropyrrolo [3,1+-b]pyridine (203) via dehydrogenation of 202. / Department of Chemistry

We have investigated the chemistry of 4-azidopyridine-N-oxide. One aspect of this thesis involved the photolysis of this azido heteroaromatic-N-oxide, to generate highly reactive nitrene intermediates. We have studied these intermediates and determined that the intermediates vary significantly in structure and reactivity from those of simpler phenyl and pyridyl systems. This study yields new insight into the structure, bonding, and energetics of nitrene species.The nitrene intermediate originating from this azide has features which could in the future help in synthetic practices and photoaffinity studies. It may aid in photoaffinity studies due to the fact that the N-oxide group imparts water solubility.This thesis investigates the premise that a change in the electronic nature of the aromatic ring results in a change in the systems reactivity. We are interested in whether changes in the nature of the ring in the azides induce large changes in the chemistry, and if so, whether they do so in a predictable manner.Another focus of the research involved 1,3-dipolar cycloaddition reactions with an azide, where a carbon-carbon double or triple bond will attach to an aromatic azide, 4-azidopyridine-N-oxide in this case, at the azido group (-N3) to generate new ring compounds. 1,3-dipolar cycloadditions are fascinating because the mechanism which takes place in the attachment phase is still under debate. These reactions were investigated by reacting 4-azidopyridine-N-oxide with an unsaturated compound (alkene or alkyne) and then analyzing the product mixtures by HPLC methods. / Department of Chemistry

No description available.

No description available.

Proefschrift Universiteit van Amsterdam. / Met lit. opg. - Met samenvatting in het Nederlands.

Thesis (M.Sc.). / Written for the Dept. of Chemistry. Title from title page of PDF (viewed 2008/01/15). Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Hong Kong, 1999. / Includes bibliographical references.

Thesis (Ph. D.)--University of Hong Kong, 1999. / Includes bibliographical references.

Thesis (M. Phil.)--University of Hong Kong, 2000. / Includes bibliographical references (leaf 158).