which can be distilled under high vacuum and recrystallized. They revert to their precursors on Pd-catalysed hydrogenation. Configuration and atomic distances were obtained by X-ray diffraction analysis. EPR hfc constants were assigned with the help of 15 N labeling and exchange of a phenyl hydrogen atom for a tert-butyl group. The X-ray and EPR results show that the novel radicals are to be considered
2-叔丁基-3-(叔丁基
氨基)-2H-
吲唑与
氧化铅 (IV) 的氧化产生红色、稳定的自由基,可在高真空下蒸馏和重结晶。它们在 Pd 催化的氢化作用下恢复为它们的前体。通过X射线衍射分析获得构型和原子距离。EPR hfc 常数是在 15 N 标记和苯基氢原子交换为叔丁基的帮助下指定的。X射线和EPR结果表明,新自由基被认为是环状
肼自由基,通过涉及环外亚
氨基和苯环的未配对电子离域改性。