A silacyclohexane compound, a method of preparing it and a liquid crystal composition containing it.

摘要

1. A silacyclohexane compound represented by the following general formula (I): <CHEM> wherein R denotes a linear-chain alkyl group with a carbon number of 1-10, a mono- or di-fluoroalkyl group with a carbon number of 1-10, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, or an alkenyl group with a carbon number of 2-8, the relationship between R and (B) as well as between (A) and the substitutional group X is trans, at least one of <CHEM> and <CHEM> denotes a 1-sila-1,4-cyclohexylene or a 4-sila-1,4-cyclohexylene group-whose silicon at position 1 or position 4 comprises substitutional group(s) selected from H, F, Cl or CH3 and the other is a 1,4-cyclohexylene group, X denotes a substitutional group at an equatorial position, specifically CN, an alkyl group with its end group replaced by a trifluoromethyl group, an alkoxy group, an alkanoyloxy group, an alkoxycarbonyl group or a linear-chain alkyl group with a carbon number of 1-10, or an alkoxyalkyl group with a carbon number of 2-7 and Y denotes a substitutional group at an axial position, specifically hydrogen or CN, a liquid crystal composition containing said silacyclohexane compound and a liquid crystal display element containing said liquid crystal composition.