Optically active silacyclohexane compounds, liquid crystal compositions comprising the same and liquid crystal display devices comprising the compositions
                        
                            
                                申请人:SHIN-ETSU CHEMICAL CO., LTD.
                            
                            
                                公开号:EP0761674A1
                            
                            
                                公开(公告)日:1997-03-12
                            
                            
An optically active silacyclohexane compound of the formula (I)
 wherein R is an organic residue, X is -CH2- or -O-; Z is a group which has at least one chiral carbon atom; L1 and L2 are independently H or F, n is 0 or 1;
 is a 1,4-cyclohexylene group or a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group wherein the silicon atom at the 1 or 4 position, respectively, is substituted by H, F, Cl, or CH3;
 is a 1,4-cyclohexylene group, a 1,4-phenylene group or a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group wherein the silicon atom at the 1 or 4 position, respectively, is substituted by H, F, Cl or CH3 provided that at least one of
 is a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group as defined above. A liquid crystal composition comprising the compound and a liquid crystal display device comprising the composition are also described.
                            式(I)的光学活性
硅环己烷化合物
 其中 R 是有机残基,X 是-
CH2-或-O-;Z 是至少有一个手性碳原子的基团;L1 和 
L2 独立地是 H 或 F,n 是 0 或 1;
 是1,4-
环己烯基团或反式-1-
硅杂-1,4-
环己烯或反式-4-
硅杂-1,4-
环己烯基团,其中位于1或4位的
硅原子分别被H、F、Cl或
CH3取代;
 是 1,4-
环己烯基团、1,4-亚苯基基团或反式-1-
硅杂-1,4-
环己烯基团或反式-4-
硅杂-1,4-
环己烯基团,其中 1 位或 4 位的
硅原子分别被 H、F、Cl 或     取代,条件是其中至少有一个
 是如上定义的反式-1-
硅杂-1,4-
环己烯基团或反式-4-
硅杂-1,4-
环己烯基团。此外,还描述了包含该化合物的液晶组合物和包含该组合物的液晶显示装置。