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Thiophene derivativesR 0090 Structural Aspects of Iodine-Promoted One-Pot Cyclization of σ-Bis(methyl-

thio)stilbenes to Thieno[3,2-b]thiophene Derivatives: Synthetic Trials of Tetrathienoacenes from 1,2-Bis(3-methylthiothiophen-2-yl)ethenes. — Attempts to prepare tetrathienoacenes (III) from compounds (II) by iodine-promoted cyclization fail. This is attributed to the bond angle defined by the thiophene α,β-bond and the neighbouring carbon atom in the ethene moiety as the key structural factor. — (YAMAMOTO, T.; MIYAZAKI, E.; TAKIMIYA*, K.; Heterocycles 76 (2008) 1, 583-593; Dep. Appl. Chem., Fac. Eng., Hiroshima Univ., Higashi-Hiroshima 739, Japan; Eng.) — R. Langenstrassen

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ChemInform 2009, 40, issue 09 © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim