SYNTHESIS AND LIQUID CRYSTAL PROPERTIES OF SOME URETHANS.

Article abstract of DOI:10.1080/15421407508082844

The urethan (carbamate) linkage ( - NHCOO - ) has been investigated as a central group in liquid crystal systems. Cholesteryl N-para-substituted-phenylcarbamates exhibit cholesteric mesophases with mesophase stability roughly parallel to increasing molecular polarizability. A smectic, in addition to a cholesteric mesophase was found in the case of cholesteryl N-n-hexadecylcarbamate. The n-octyl analog has a monotropic cholesteric mesophase, while the n-butyl analog is not mesogenic. The N-para-methoxyphenylcarbamates of cholesterol, cholestanol, stigmasterol, alpha -sitosterol, campesterol, and 5-androstene-3 beta -ol-17-one, with the exception of the latter which was not mesogenic, exhibit enantiotropic mesophases. Twenty-five other nonsteroidal urethans having a wide variety of structures, as well as several urea derivatives, were prepared but none was mesogenic.

Full text of DOI:10.1080/15421407508082844

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Molecular Crystals and Liquid Crystals
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Synthesis and Liquid Crystal Properties of Some
Urethans
Lawrence Verbit a & George A. Lorenzo a
a Department of Chemistry , State University of New York at Binghamton , Binghamton, New
York, 13901, U.S.A.
Published online: 21 Mar 2007.
To cite this article: Lawrence Verbit & George A. Lorenzo (1975) Synthesis and Liquid Crystal Properties of Some Urethans,
Molecular Crystals and Liquid Crystals, 30:1-2, 87-99, DOI: 10.1080/15421407508082844
To link to this article: http://dx.doi.org/10.1080/15421407508082844
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