Silacyclohexane compound, a method of preparing it and a liquid crystal composition containing it

摘要

A silacyclohexane compound represented by the following general formula (I) <IMAGE> (I) wherein R denotes a linear-chain alkyl group with a carbon number of 1-10, a fluoroalkyl group with a carbon number of 1-10 in which a fluorine atom(s) is substituted for one or two hydrogen atoms, 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. <IMAGE> denotes a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH3. L1 and L2 independently denote H or F. L3 and L4 independently denote H, F or Cl. X denotes a H, CN, F, Cl, CF3, CF2Cl, CHFCl, OCF3, OCF2Cl, OCHFCl, OCHF2, or a linear-chain alkyl or alkoxy group with a carbon number of 1-10. i, j and k respectively denote 0 or 1, where (i+j+k) is 0 or 1. n denotes 0, 1 or 2.