Oligomeric 2,5-thienylenes and 3-methyl-2,5-thienylenes have been synthesized by NiC12(dppp) (dppp = Ph2PCH2CH2CH2PPh2) coupling of Grignard compounds with the appropriate bromothiophene; U.V. spectra and oxidation potentials of the oligomers are dicussed in terms of coplanarity of the oligomeric species.
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