A reinvestigation was made of thiophene polymerization by trifluoroacetic acid with the aim of elucidating the structure of the oligomer product. Comparison of spectral and molecular weight data was made with corresponding data for thiophene polymer generated by means of aluminum chloride and for trimer prepared from thiophene–phosphoric acid. We conclude that the solid product from thiophene–trifluoroacetic acid is best represented by the following structure: magnified image In addition, the major product is the known liquid trimer: magnified image Our designation is in disagreement with that of Wassermann et al., who proposed a structure having aliphatic unsaturation.
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Margosian et al. (1979) studied this question.
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