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Noe, Christian R. and Knollmüller, Max and Wagner, Ernst (1986): Ein einfaches Verfahren zur Herstellung anellierter Thiophene. In: Monatshefte für Chemie / Chemical Monthly, Vol. 117, No. 5: pp. 621-629
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Abstract

A simple method for the synthesis of fused thiophenes by reaction of agr-carboxymethyl substituted cyclic ketones withLawesson-reagent is described. Considerations concerning the reaction mechanism are given.