| abstract |
The invention pertains to thiophenes of the formula (I), where n is 2 to 6; L<1> and L<2> are hydrogen, optionally substituted C1-C10 alkyl, C3-C7 cycloalkyl or phenyl, or L<1> and L<2> together with the connecting nitrogen atom represent a heterocyclic radical; X and Y are hydrogen, optionally substituted C1-C10 alkyl, C3-C7 cycloalkyl or phenyl; and Z is cyano, hydroxysulfonyl, C1-C10 alkoxycarbonyl, optionally substituted C1-C4 alkylsulfonyl, optionally substituted phenylsulfonyl or a radical of the formula (a), where R<1> is hydrogen or cyano and R<2> and R<3> are cyano, nitro, C1-C10 alkoxycarbonyl, optionally substituted C1-C4 alkylsulfonyl or optionally substituted phenylsulfonyl. The invention also relates to the use of said thiophenes in nonlinear optics, a method for the preparation of bithiophenes, and stannylthiophenes as their intermediates. |