Silacyclohexane carbaldehyde compounds and processes for preparing silacyclohexane-based liquid crystal compounds from the carbaldehyde compound

摘要

A silacyclohexane carbaldehyde compound of the following formula (I) <IMAGE> (I) wherein Ar represents a phenyl group or a tolyl group, and R represents a phenyl group, a tolyl group, a linear alkyl group, a mono or difluoroalkyl group, a branched alkyl group, an alkoxyalkyl group or an alkenyl group. Processes for preparing a silacyclohexane-based liquid crystal compound of the following formula (II) or (III) from the silacyclohexane carbaldehyde are also described <IMAGE> (II) or <IMAGE> (III) wherein X represents CN, F, Cl, CF3, CClF2, CHClF, OCF3, OCClF2, OCHF2, OCHClF, (O)mCT=CX1X2, O(CH2)r(CF2)sX3, R or OR wherein m is a value of 0 or 1, T and X1 independently represent H, F or Cl, X2 represents F or Cl, r and s are, respectively, a value of 0, 1 or 2 provided that r+s=2, 3 or 4, X3 represents H, F or Cl, and R has the same meaning as defined before, Y and Z independently represent a halogen or a methyl group, i and j are independently a value of 0, 1 or 2.