Imines and derivatives. Part 21. A study of structural and mechanistic aspects of the synthesis of imine, imine oxide, and oxime derivatives of 2,2,4,4-tetramethylcyclobutane-1,3-dione by X-ray crystallography and nuclear magnetic resonance and ultraviolet spectroscopy
作者:A. John Boyd、Derek R. Boyd、Michael G. Burnett、John F. Malone、W. Brian Jennings
DOI:10.1039/p29880002093
日期:——
The dinitrone derivatives (5a, b) of 2,2,4,4-tetramethylcyclobutane-1,3-dione were synthesised by peroxyacid oxidation of the corresponding di-imines (3a, b). X-Ray crystallographic analysis of di-imine (3a) and the hydroxyimino nitrone isomers (6a, b) indicate a marked buttressing effect leading to an exclusive preference for the trans geometry in di-imine (3a) and dinitrone (5a). Thermal elimination
所述dinitrone衍生物(图5a,b 2,2,4,4-四甲基-1,3-二酮的)分别用对应的二亚胺的过氧酸氧化(合成图3a,b)。二亚胺(3a)和羟基亚氨基硝酮异构体(6a,b)的X射线晶体学分析表明,明显的支撑效应导致对二亚胺(3a)和二硝基(5a)的反式几何构型的排他性偏爱。N -Bu t取代的硝酮(5a),(6a)的热消除反应)和(8a)生成肟和2-甲基丙烯已通过uv动力学研究进行了研究。结果与涉及五元循环过渡态的协调机制一致。