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The system Pd(OAc)2/dppb was found to be an efficient catalyst precursor for the direct arylation of 3‐formylthiophene derivatives. When using 3‐formylthiophene, the 2‐arylated thiophenes were obtained with regioselectivities of 76–86 %, whereas the arylation of 3‐formylthiophene diethyl acetal gave the 5‐arylated thiophenes with regioselectivities of 64–88 %. These reactions were performed by using...
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