【序号】: 1 【作者】: D. W. Hein, R. J. Alheim, J. J. Leavitt 【题名】: The Use of Polyphosphoric Acid in the Synthesis of 2-Aryl- and 2-Alkyl-substituted Benzimidazoles, Benzoxazoles and Benzothiazoles1【期刊】: J. Am. Chem. Soc., 【年、卷、期、起止页码】: 1957, 79 (2), pp 427–429 【全文链接】:http://pubs.acs.org/doi/abs/10.1021/ja01559a053