4-乙烯基环氧环己烷的溴化反应——4-乙烯基环氧环己烷的邻基参与反应研究

Bromination Reaction of 4 Vinyl 7 oxabicyclo heptane ——A Study of the Neighbouring Group Participation Reaction

对４－乙烯基环氧环己烷的溴化反应进行了研究。结果表明，顺式的４－乙烯基环氧环己烷与溴进行加成反应时，发生了邻基参与反应，生成五元或六元的环醚化合物；反式的４－乙烯基环氧环己烷只和溴发生加成反应，生成４－（１，２－二溴）－乙基环氧环己烷。当４－乙烯基环氧环己烷与溴等摩尔反应时，邻基参与反应的比例和加成反应的比例相等。

In this paper, the reactions of the bromination of 4 vinyl 7 oxabicyclo heptane were studied, and it was found that during the reactions, 5 or/and 6 members cyclic ethers was given by neighbouring participation reaction from cis 4 vinyl 7 oxabicyclo heptane, while 4 (1,2 dibromo) ethyl 7 oxabicyclo heptane was given by addition reaction from trans 4 vinyl 7 oxabicyclo heptane. When 4 vinyl 7 oxabicyclo heptane was reacted with bromine in 1∶1 ratio(mol), the molal quantity of participation reaction's product was equal with that of addition reaction's.