摘要：

Cyclic compounds have the formula I R1- (A1-Z1) n-A2-R2 wherein R1 represents alkyl having 1 to 12 C atoms, where one or more nonadjacent CH 2 groups may be substituted with -O-, -CO-, -O-CO- and / or -CO-O-, A1 and A2 are independently each other trans-1,4-cyclohexylene, where one or two nonadjacent CH 2 groups may be substituted with O and / or S, or unsubstituted 1,4-phenylene or substituted with halogen, CN and / or CH 3, where one or more CH groups may be substituted with N, Z1 is -CO-O-, -O- CO-, -CH2CH2- or a single bond, n is 1,2 or 3 and R2 is -CO-CH2-COO-alkyl, -O-COO-alkyl or in case A2 = trans-1, 4-cyclohexylene group, it may also represent -CO-CH2-CO-alkyl. Alkyl represents an alkyl group straight or single-branched chain having 1 to 10 carbon atoms, provided that if R 2 = -O-CO-O-alkyl, R1- (A1-Z1) n-A2- represents ( a), (b) or (c). These compounds are useful as liquid crystal component phases.

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