Document Type

Thesis - Open Access

Award Date

1970

Degree Name

Master of Science (MS)

Department

Chemistry

Abstract

As analyzed by mass spectrometry, ultraviolet spectroscopy, and gas liquid chromatography, the unconjugated thiones prepared were composed of mainly monomer in the presence of some dimer. Certain literature reports on the ultraviolet absorption spectra of unconjugated thiones are erroneous. The monomeric thiones have two electronic transitions at 500nm and at 2J0nm. A transition observed at 210nm was assigned to the transition of the thione dimers (l,J-dithietanes). Nuclear magnetic resonance studies showed that the hydrogens cl to the thione chromophore resonate at lower field than do hydrogens of the corresponding ketones. The chemical shift of the methyl group next to the tbione chromophore was observed to be at 2.75owith respect to TMS in carbon tetrachloride. Mass spectral studies indicated that the thiones have fragmentation patterns similar to the corresponding ketones. Dimers (l,3-dithietanes) of monomeric thiones form via a photosynthetic pathway. The mechanism was suggested as occurring by an excited state.

Library of Congress Subject Headings

Ketones

Chemistry, Organic

South Dakota State University Theses

Format

application/pdf

Number of Pages

49

Publisher

South Dakota State University

Share

COinS