Optically active compounds, smectic liquid crystal compositions containing them and smectic liquid crystal display devices.

摘要

An optically active compound having the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="13" wi="83" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>-CH<Sub>2</Sub>CH<Sub>2</Sub>-, -OCH<Sub>2</Sub>- or -CH<Sub>2</Sub>O-, R is an alkyl group having from 1 to 12 carbon atoms, an alkoxy group having from 1 to 12 carbon atoms, a cyano group or a halogen atom, each of rings A and B is a 1,4-di-substituted phenylene group or a trans-1,4-di-substituted cyclohexylene group, n is 0 wherein each of Z and Z' is a single bond, -COO-, -OCO-,
<Chemistry id="chema02" num="0002"><Image id="ia02" he="16" wi="128" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry><Chemistry id="chema03" num="0003"><Image id="ia03" he="17" wi="74" file="IMGA0003.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein <Sup>*</Sup> indicates an optical center, and R' is an alkyl group having from 2 to provided that when
<Chemistry id="chema04" num="0004"><Image id="ia04" he="12" wi="26" file="IMGA0004.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>R is the alkyl 12 carbon atoms or
<Chemistry id="chema05" num="0005"><Image id="ia05" he="8" wi="15" file="IMGA0005.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>, where R" is a hydrogen atom, group or the alkoxy group. an alkyl or alkoxy group having from 1 to 12 carbon atoms, I