A simple and facile solventless procedure for the cyclization of 2′-amino- and 2′-hydroxy-chalcones using silica-supported sodium hydrogen sulphate as heterogenous catalyst
K Hemanth Kumar, P T Perumal
Canadian Journal of Chemistry, 2006, 84(8): 1079-1083,
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http://dx.doi.org/10.1139/v06-133