作者:D.J. Donnelly、J.A. Donnelly、J.R. Keegan
DOI:10.1016/0040-4020(77)80152-x
日期:1977.1
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
αbromo 2羟基-4-硝基查耳酮的(E)和(Z)异构体均显示出非寻常的能力,可进行亲核加成至双键的α位。它们明显不同,但是,在它们的优选方式中,前者偏爱α加成,后者偏爱β加成。提出这些异构体是2-羟基-4-硝基查尔酮二溴化物在Emilewicz-von Kostanecki环化成金酮和黄酮的混合物中的中间体。