| 摘要 |
PCT No. PCT/GB88/00880 Sec. 371 Date Apr. 11, 1990 Sec. 102(e) Date Apr. 11, 1990 PCT Filed Oct. 19, 1988 PCT Pub. No. WO89/03821 PCT Pub. Date May 5, 1989.Laterally cyano-substituted terphenyls of formula (I), wherein R1 and R2 are independently selected from hydrogen or C1-15 alkyl, alkoxy, or alkyl or alkoxy in which one or more CH2 groups are replaced by O, COO, OOC, CHX, CX2, CH=CX, CX=CH, CX=CX, where X is fluorine or chlorine. CRCN where R is alkyl, or C 3BOND C or in which a terminal CH3 of the said alkyl or alkoxy chain is replaced by CF3, n is 0 or 1, and the CN and F (if present) substituent are independently located in any of the available substitution positions. Liquid crystal materials containing these terphenyls are also described.
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