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Treatment of 2‐pyridyl 2‐thienyl sulfoxide with 2‐thienyllithium was found to give both 2‐(2‐pyridyl)thiophene 2 and 2,5‐(di‐2‐pyridyl)thiophene 3 . The reaction between 2‐thienyllithium and thionyl chloride was found to give 2,2′‐bithienyl 8 , a coupling product, which is also formed by the reaction between di‐2‐thienyl sulfoxide 7 and 2‐thienyllithium.
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Ōae et al. (1993) studied this question.
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