| 摘要 |
Compounds of the formula (I) where: X<1 >is H or F G<1>-G<2 >is -CH2-CH- or CH=C- R<1>, R<2 >are a) H b) the M<2>-A<2>-R<5 >moiety c) for example, a straight-chain or branched alkyl radical having from 1 to 16 carbon atoms R<3 >and R<4 >are each, for example, H, the M<2>-A<2>-R<5 >moiety or a straight-chain or branched alkyl or alkyloxy radical having from 1 to 16 carbon atoms A<2 >is, for example, 1,4-phenylene, with the provisos that a) when R<2 >is not H, R<1 >and R<3 >have to be H, b) when R<2 >is H, R<4 >must not have the definitions c) or d), c) R<1>, R<2>, R<3 >and R<4 >must not at the same time be H.
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