Accession Number:

AD0754466

Title:

S-Cholesteryl Alkanethioates

Descriptive Note:

Corporate Author:

ARMY NIGHT VISION LAB FORT BELVOIR VA

Personal Author(s):

• Elser, Wolfgang
• Pohlmann, Juergen L. W.
• Boyd, Phillip R.

Report Date:

1970-07-13

Pagination or Media Count:

10.0

Abstract:

A homologous series of S-cholesteryl alkanethioates was prepared by reaction of 3beta-mercaptocholest-5-ene with the imidazolides of alkanoic acids. The mesomorphic properties of 20 members, S-cholesteryl thioformate through eicosanethioate were determined. All alkanethioates are monotropic cholesteric except the cholesteryl thioformate. Cholesteryl thioheptanoate and all higher homologues in this series also exhibit a monotropic smectic mesophase. A comparison with the corresponding cholesteryl alkanoates shows that the replacement of the ester group by the thiol ester group leads to an increase in both the smectic-cholesteric and the cholesteric-isotropic transition temperatures.

Descriptors:

• *CHOLESTERYL ESTERS
• *PHASE STUDIES
• *LIQUIDS
• ORGANIC SULFUR COMPOUNDS
• MOLECULAR STRUCTURE

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE