of tert‐butylgalvinol with perdeuteriated tert‐butyl groups and of 1,4‐bicyclo[2.2.2]octanebisgalvinol are described. The EPR and ENDOR spectra of the corresponding galvinoxyl monoradicals reveal selective line broadening due to dynamic processes associated with hindered internal rotation of the phenoxy rings. Deuteriation of the central tert‐butyl group in tert‐butylgalvinoxyl gives rise to a substantial
描述了具有过
氘化叔丁基的叔丁基加尔文醇和 1,4-双环 [2.2.2]
辛烷双加尔文醇的合成。相应的加尔文氧基单自由基的 EPR 和 ENDOR 光谱揭示了由于与苯氧基环内部旋转受阻相关的动态过程而导致的选择性谱线增宽。叔丁基加尔万氧基中心叔丁基的
氘化导致 EPR 线宽的显着减小,从而允许通过线形分析确定动力学参数(ΔH≠ = 21.8 kJ mol-1,ΔS≠ = −32 J mol−1 K−1)。双自由基 1,4-双环 [2.2.2]
辛烷双加尔文氧基表现出强烈的标量和偶极电子相互作用(D = 97
MHz)。