| http://www.w3.org/ns/prov#value | - This reaction can be performed using acids,2 silica gel,3 bases,4,5 light,6 heat,7 or electrons.8 The acid catalyzed cyclization can be carried out by refluxing the chalcone in acetic acid, or also in ethanol or other suitable solvent, in the presence of an acid catalyst such as H2SO4 or H3PO4.9 Basic conditions are seldom used due to decomposition or retroaldol reaction. 9 The corresponding chalc
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