作者:R.G. Pews、C.W. Roberts、C.R. Hand
DOI:10.1016/s0040-4020(01)93021-2
日期:1970.1
hexabromocyclopentadiene (1) with sodium methoxide in methanol-glyme provides 1,2,3,4-tetrabromo-5,5-dimethoxycyclopentadiene (6). The reactivity of this new diene in the Diels-Alder reaction has been determined with a number of dienophiles. The greater reactivity of ketal 6 towards maleic anhydride compared to cyclopentadiene suggests that 6 behaves as an electron-rich diene in the Diels-Alder reaction.
在甲醇-甘醇二甲醚中用甲醇钠处理六溴环戊二烯(1),得到1,2,3,4-四溴-5,5-二甲氧基环戊二烯(6)。该新二烯在狄尔斯-阿尔德反应中的反应性已经通过许多亲二烯体确定。与环戊二烯相比,缩酮6对马来酸酐的反应性更高,表明6在Diels-Alder反应中表现为富电子二烯。