A Convenient Synthesis of Symmetric 1,2-Diarylethenes from Arylmethyl Phosphonium Salts
作者:Julius N. Ngwendson、Walters N. Atemnkeng、Cassandra M. Schultze、Anamitro Banerjee
DOI:10.1021/ol061594z
日期:2006.8.1
Symmetric ethenyldithiophenes are important intermediates for synthesis of photochromic materials and organic conductors. When acetonitrile is used as a solvent, 3-methylthiophenylphosphonium salts form symmetric ethenyldithiophenes in the presence of a strong base (e.g., NaH, (t)BuOK) in moderate to high yields. This homocoupling reaction is faster than a Wittig reaction with aromatic ketones in acetonitrile
对称的乙烯基二噻吩是光致变色材料和有机导体合成的重要中间体。当使用乙腈作为溶剂时,3-甲基硫代苯基phosph盐在强碱(例如NaH,(t)BuOK)存在下以中等至高收率形成对称的乙烯基二噻吩。该均偶联反应比与乙腈中的芳族酮的维蒂希反应更快。我们的研究表明,极性非质子溶剂的存在会促进均偶联反应。