Accession Number : ADA133705

Title :   Carbene Chemistry. I. Stereochemical Integrity at C Alpha in Ketone Tosylhydrazones. II. Hydrogen Migration in 2-Carbena-6,6-Dimethylnorbornane.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Balyeat,John Robert

PDF Url : ADA133705

Report Date : Feb 1978

Pagination or Media Count : 84

Abstract : The tosylhydrazones of exo-3-deuteriocamphor and 2-deuterio-2,4-dimethyl-3-pentanone were treated with N-bromosuccinimide (NBS) and pyruvic acid to regenerate the parent ketones. The ketones from the pyruvic acid cleavage show a significant loss of deuterium. The ketones from the NBS cleavage show no loss of deuterium, indicating that stereochemical integrity at C sub alpha is maintained during the NBS cleavage. The tosylhydrazones and corresponding lithium salts of exo and endo-3-deuterio-6,6-dimethylnorbornan-2-one are found to maintain their stereochemical integrity at C sub alpha. Thermal and photolytic decomposition of the lithium salts reveals a 3,2 hydride migration preference of 19:1 in favor of the exo hydrogen. Torsional interactions in the hydride migration transition state of a classical singlet carbene are suggested as an explanation for the observed stereo-selectivity.

Descriptors :   *Carbenes, *Hydrazones, *Chemical reactions, Unsaturated hydrocarbons, Stereochemistry, Ketones, Hydrogen, Migration, Carbonyl compounds, Reduction(Chemistry), Deuterium compounds, Theses

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE