| 摘要 |
Heterocyclic liquid-crystal compounds containing the structural unit <IMAGE> in which M is H, CN, NCS, halogen or an alkyl group having 1-5 carbon atoms, X is CR<4> or N, Y is CHR<4>, O, S or NR<5>, R<4> is H, alkyl having 1-15 carbon atoms, halogen or cyano, and R<5> is H or alkyl having 1-15 carbon atoms, with the proviso that, in the case of Y = CHR<4>, X is N, are suitable as components of liquid-crystalline phases.
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