Regioselective bromination of alkylated bi-and ter-thiophenes affords key building blocks for the synthesis of higher, isomerically pure alkyl oligothiophenes. For all new compounds, unequivocal structural assignment is based on a detailed analysis of the fully coupled 13C, 1H NMR spectra.
P. Bäuerle, F. Pfau, H. Schlupp, F. Würthner, K. Gaudl, M. B. Caro and P. Fischer, J. Chem. Soc., Perkin Trans. 2, 1993, 489 DOI: 10.1039/P29930000489
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