Oligomeric 2,5-thienylenes and 3-methyl-2,5-thienylenes have been synthesized by NiCl2(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.
D. D. Cunningham, L. Laguren-Davidson, H. B. Mark, C. Van Pham and H. Zimmer, J. Chem. Soc., Chem. Commun., 1987, 1021 DOI: 10.1039/C39870001021
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