Sterisch stabilisierte vinylnitroxide und radikalanionen von nitrosoalkenen: Hyperkonjugation in verdrillten π-radikalen—VI
作者:W. Ahrens、K. Wieser、A. Berndt
DOI:10.1016/0040-4020(75)80299-7
日期:1975.1
Alkylvinyl nitroxides with considerable delocalisation of the unpaired electron into the vinyl group are obtained for the first time by spin trapping using the unusually stable nitrosoalkene 1. Increase of the coupling constants of the protons at Cα with increasing steric hindrance in the radicals is explained by hyperconjugation in twisted π-radicals. The phenyl vinyl nitroxide 2e is shown to be twisted
烷基乙烯基氮氧自由基具有相当的离域的不成对电子到乙烯基的通过旋使用异常稳定nitrosoalkene捕集首次获得1。在质子的耦合常数的增加Ç α与由扭曲的π基团超共轭解释在基团增加空间位阻。苯基乙烯基氮氧2E被示出为被扭曲约50°在NC α -键。首次描述了亚硝基烯烃的自由基阴离子。