Structural Effects on Thermal Rearrangement of Fulleroids to Methanofullerenes. The Prominent Role of Cyclopropyl vs Aryl Substituent
作者:Hiroshi Kitamura、Takumi Oshima
DOI:10.1021/ol702691y
日期:2008.1.1
The kinetics of the thermal rearrangement of a series of novel cyclopropyl-substituted [5,6] open fulleroids to the [6,6] closed methanofullerenes have been investigated in comparison with the aryl-substituted homologues. The cyclopropyl group markedly accelerated the rates due to the stereoelectronically favorable pi-conjugative effects in the radical-like [1,5] shift of the transient [5,6] closed
与芳基取代的同系物相比,已经研究了一系列新的环丙基取代的[5,6]开环富勒烯热合成[6,6]封闭的亚甲基富勒烯的动力学。由于在瞬态[5,6]封闭异构体的自由基状[1,5]转移中,立体丙基有利的π共轭作用,环丙基大大加快了速率,从而取代了几何受约束的芳基。