Cyclisation of ω-(isocyanatocarbonyl)alkyl radicals: acyclic precursors of imidyl radicals
作者:Parveen Kaushal、Brian P. Roberts
DOI:10.1039/p29890001559
日期:——
2,2-dimethylsuccinimidyl radical which subsequently undergoes rin opening to yield Me2ĊCH2C(O)NCO (15). The overall rearrangement of (14) to (15) represents 1,2-shift of the –C(O)NCO group via an intermediate imidyl radical. The glutarimidyl radical is forme by 1,6-endo cyclisation of H2ĊCH2CH2C(O)NCO. It is proposed that the rapid cyclisation of ω-isocyanatoalkyl radicals provides strong evidence
由N-卤代亚胺的光解或卤素原子的提取生成的亚胺基自由基在Bu 2 t C CH 2的有效捕集下得到了相对持久的加合物,这已通过es光谱学进行了研究。溴原子抽象从BRCH 2 CH 2 C(O)NCO(2)得到ħ 2 CCH 2 C(O)NCO(1),其经历快速1,5-内切环化,得到琥珀酰亚胺基团。已使用esr光谱结合Bu 2 t C CH 2的自旋阱对这种环化进行了研究。和BU吨Ñ O.为(环化率系数1)已被估计为3.7×10 6小号-1在环己烷328ķ从(之间的自由基链式反应的产物的分析2)的triethylgermane。ESR和产物的分析研究表明,ħ 2 CCME 2 C(O)NCO(14)cyclises,MOR速度比(1),得到2,2- dimethylsuccinimidyl基团,其随后经历RIN开口,得到我2 CCH 2 Ç (O)NCO(15)。(14)至(15)的整体重排