Chalcone dihalides—IX1
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Add time:07/28/2019 Source:sciencedirect.com
The (E) and (Z) isomers of α bromo 2 hydroxy-4-nitrochalcone both exhibited the unusual ability to undergo nucleophilic addition to the α position of the double bond. They differed markedly, however, in their preferred mode, the former favoured α addition, the latter β addition. It is proposed that these isomers are intermediates in the Emilewicz-von Kostanecki cyclization of 2 hydroxy-4-nitrochalcone dibromide to a mixture of aurone and flavone.
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