| 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 of formula a1, a2 or b;n n n Z 1 is 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 and B represents a ring system of formula a1 or a2, and Z 1 or Z 2 as defined below represents a single bond. Formula a1 Formula a2 Formula b n n n In the above formula, One or two nonadjacent CH 2 groups in the trans-1,4-cyclohexylene ring can be replaced by oxygen, and one or two nonadjacent CH groups in the 1,4-phenylene ring by nitrogen Can be; L 1 , L 2 and L 3 are each 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 2 and Z 3 are each 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 Crosslinkable liquid crystal compound, refractive index, birefringence, orientation, optical member, photoinitiator. |