| abstract |
Compounds of formula (I).n n n Formula In n n RS 1 -AZ 1 -BS 2 -Rn n n In the above formula,n n n A and B are independent ring systems having the formula a 1 , a 2 or b,n n n n n n n n Wherein one or two non-adjacent CH 2 groups in the trans-1,4-cyclohexylene ring can be replaced with oxygen and one or two non-adjacent CH groups in the 1,4-phenylene ring are nitrogen Can be replaced with;n n n L 1 , L 2 , L 3 are independently hydrogen, C 1 -C 20 -alkyl, C 1 -C 20 -alkenyl, C 1 -C 20 -alkoxy, C 1 -C 20 -alkoxycarbonyl, formyl, C 1 -C 20 -alkylcarbonyl, C 1 -C 20 -alkyl carbonyloxy, halogen, cyano or nitro;n n n Z 1 , Z 2 , Z 3 are independently a single bond, -CH 2 CH 2- , -CH 2 O-, -OCH 2- , -COO-, -OOC-,-(CH 2 ) 4- , -O (CH 2 ) 3 -,-(CH 2 ) 3 O- or -C≡C-;n n n S 1 and S 2 represent a spacer unit;n n n R represents a crosslinkable group;n n n Provided that at least one of ring systems A or B represents a ring system having the formula a 1 or a 2 , and Z 1 or Z 2 represents a single bond. |