作者:Janusz Baran、Herbert Mayr
DOI:10.1016/s0040-4020(01)81013-9
日期:1989.1
The hexamethyl substituted bismethylenecyclopentane 1a is 4 to 7 times more reactive towards the acetylenic dienophiles 2 and 3 than the nonmethylated 1,2-bismethylenecyclopentane 1b. This unusual consequence of branching is explained in terms of steric and electronic effects.
的六甲基取代的bismethylenecyclopentane 1A是4〜7倍朝向炔亲双烯体更具反应性的2和3比nonmethylated 1,2- bismethylenecyclopentane 1B。分支的这种不寻常的结果是根据空间效应和电子效应来解释的。