Synthesis and Mesomorphic Properties of Some Aromatic Esters Containing 2-Butyl, 2-Octyl and 2-Methylbutyl Moieties in the Terminal Chains

M. E. Neubert Liquid Crystal Institute, Kent State University, Kent, OH, 44242; Chemistry Department, Kent State University, Kent, OH, 44242; Kent State University, Kent, OH, 44242; MCE, Eastman Kodak Company, Rochester, NY and WCJ, Aldrich Chemical Co., Milwaukee, Wis

S. S. Keast Liquid Crystal Institute, Kent State University, Kent, OH, 44242; Chemistry Department, Kent State University, Kent, OH, 44242

M. C. Ezenyilimba Liquid Crystal Institute, Kent State University, Kent, OH, 44242; Chemistry Department, Kent State University, Kent, OH, 44242; Kent State University, Kent, OH, 44242; MCE, Eastman Kodak Company, Rochester, NY and WCJ, Aldrich Chemical Co., Milwaukee, Wis

C. A. Hanlon Liquid Crystal Institute, Kent State University, Kent, OH, 44242; MCE, Eastman Kodak Company, Rochester, NY and WCJ, Aldrich Chemical Co., Milwaukee, Wis

W. C. Jones Liquid Crystal Institute, Kent State University, Kent, OH, 44242; MCE, Eastman Kodak Company, Rochester, NY and WCJ, Aldrich Chemical Co., Milwaukee, Wis

Abstract

A variety of esters/thioesters (Z˭O/S) with terminal chains containing sterically hindered branched chains containing

and

in either the X or Y chain attached to the benzene ring through an ether oxygen atom, (CH₂)_nCO₂‒ or (CH₂)_nOCO‒ with n = 0–2 and the other chain being R, RO, RCO, RCO₂, or ROCO were synthesized as possible new ferroelectric liquid crystals or dopants in mixtures of branched chain phenylbenzoates and phenylthiobenzoates. The main goal was to incorporate substituents that favor larger spontaneous polarization than observed for the thioesters with Z ˭ S and

and determine if these compounds would have the desired N, S_A and S_c properties. The best properties were observed in the esters with

Some cyclohexane diesters and lateral substituted esters containing these branched chains were also prepared. Two branched chain esters/thioesters with X ˭ CN were synthesized as potential cholesteric blue phase materials. These compounds were prepared using slightly modified procedures reported earlier. Comparisons in mesomorphic properties are discussed.

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Synthesis and Mesomorphic Properties of Some Aromatic Esters Containing 2-Butyl, 2-Octyl and 2-Methylbutyl Moieties in the Terminal Chains

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Synthesis and Mesomorphic Properties of Some Aromatic Esters Containing 2-Butyl, 2-Octyl and 2-Methylbutyl Moieties in the Terminal Chains

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