J. Am. Chem. Soc., 1957, 79 (2), pp 427–429
The Use of Polyphosphoric Acid in the Synthesis of 2-Aryl- and 2-Alkyl-substituted Benzimidazoles, Benzoxazoles and Benzothiazoles
D. W. Hein, R. J. Alheim, J. J. Leavitt
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http://dx.doi.org/10.1021/ja01559a053
