DISTINCTIVE STRUCTURE-REACTIVITY SEQUENCES IN THE TYPE I AND TYPE II CYCLOADDITIONS OF CYCLOPROPYL-SUBSTITUTED ETHYLENE WITH TETRACYANOETHYLENE
作者:Fumio Kataoka、Shinya Nishida
DOI:10.1246/cl.1980.1115
日期:1980.9.5
Structure-reactivity sequences of two cycloadditions, distinctive in pattern, between cyclopropylethylene and tetracyanoethylene were totally different. In the type I, a bulky group at C2 decreased the rate of the reaction, whereas, in the type II, bulky alkyls at C2 enhanced the reactivity. The results accommodate to a proposed scheme involving an electron transfer step.
环丙基乙烯和四氰基乙烯之间的两种环加成反应的结构-反应序列完全不同。在类型 I 中,C2 上的庞大基团降低了反应速率,而在类型 II 中,C2 上的庞大烷基增强了反应性。结果适用于涉及电子转移步骤的提议方案。