Fusion of the diaroylethanes with phosphorus pentasulfide produces the 2,5diarylthiophenes. By this method, Kapf and Paal (1) claimed the preparation of 2,5-diphenylthiophene in 60% yield. Holleman (2) also synthesized 2,5-di-ptolylthiophene by this procedure. The reaction is generally unsatisfactory, due to tarry products and unpredictable yields. Since phosphorus pentasulfide acts 1405
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