Preferential Incorporation of a Cyclopropyl σ Bond Over an Ethylenic π Bond in the TCNE Cycloaddition of 1,2-Dicyclopropylethylene. Occurrence of the Type-II Reaction in Some Disubstituted Substrates
作者:Shinya Nishida、Masakazu Masui、Masashi Murakami、Toshiro Imai、Takashi Tsuji
DOI:10.1246/bcsj.64.1454
日期:1991.5
Among the two types of cycloadditions known to take place in the reactions of cyclopropyl-substituted ethylenes (1) with tetracyanoethylene (TCNE) (type-1 gives a cyclobutane derivative (2) and type-II yields a vinylcyclopentane derivative (3), the type-II reaction has been practically limited to occur in reactions of tetrasubstituted substrates. However, some disubstituted substrates, namely cis-
在低极性溶剂中产生少量3;然而,II 型从未成为一个主要过程。母体乙烯基环丙烷未能在所有物质中产生 II 型加合物