A Competition between 1,3-Dipolar Cycloaddition and Substitution of Trifluoroacetonitrile Oxide
作者:Kiyoshi Tanaka、Hideyuki Masuda、Keiryo Mitsuhashi
DOI:10.1246/bcsj.58.2061
日期:1985.7
Trifluoroacetonitrile oxide reacted with conjugated olefins such as styrenes, indenes, and acyclic conjugated dienes to give not only the cycloadduct but also its linear isomeric oxime. Methyl or phenyl group attached to the unsaturated carbon of the dipolarophiles was found to favor the formation of oxime. Such a concomitant reaction was interpreted in terms of a competition between a concerted cycloaddition
三氟乙腈氧化物与共轭烯烃如苯乙烯、茚和无环共轭二烯反应,不仅生成环加合物,还生成其线性异构肟。发现与亲偶极体的不饱和碳相连的甲基或苯基有利于肟的形成。这种伴随反应被解释为协同环加成和通过氧化腈的亲电攻击进行的两步取代之间的竞争。还研究了环状共轭二烯的类似竞争,发现产品的竞争比例取决于环的大小。