| 摘要 |
The present invention relates to compounds of formula (I): <IMAGE> (I) in which A represents the same or different heteroaryl radicals and substituted heteroaryl radicals; B represents dihydroheteroarenediylidene radicals or substituted dihydroheteroarenediylidene radicals or radicals obtainable from these radicals by oxidation on at least one hetero atom; and R' and R'' represent the same or different radicals, in particular hydrogen atoms, C1- to C4-alkyl radicals or radicals A, or cyano radicals, halogen atoms, radicals of the formula -COOR, or -OR, wherein R is a C1- to C4-alkyl radical, processes for preparing the same and polymers prepared therefrom.
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