Cyclopropyl activation of adjacent methylene groups in spiro[2.n]alkanes and bicyclo[n.1.0]alkanes
作者:Charles Roberts、John C. Walton
DOI:10.1039/c39840001109
日期:——
rapidly than ‘normal’ secondary hydrogens by t-butoxyl radicals, because of favourable overlap of the p-orbital at C(2) with the HOMO of the adjacent cyclopropyl ring; the hydrogenes at C(2) in bicyclo[n.1.0]alkanes are less activated because the cyclopropyl ring orientation is less favourable for overlap.
螺[2.]中C(2)处的氢。正丁烷自由基比“正常”仲氢多出五倍以上的正丁烷,这是因为C(2)处的对位轨道与相邻的环丙基环的HOMO有良好的重叠;双环[ n .1.0]烷烃中C(2)处的氢活化较少,因为环丙基环的取向较不易重叠。