Flash vacuum thermolysis generation and a UV-photoelectron spectroscopy study of the N-substituted iminoacetonitriles
作者:Anna Chrostowska、Alain Dargelos、Alain Graciaa、Saïd Khayar、Stanisław Leśniak、Ryszard B. Nazarski、Thi Xuan Mai Nguyen、Małgorzata Maciejczyk、Michał Rachwalski
DOI:10.1016/j.tet.2009.09.008
日期:2009.11
thermolysis of cis and trans 1-benzyl and 1-allyl-2-cyano-3-phenylzetidines (1a and 1b) at 470 °C resulted in the formation of E and Z isomers of N-benzyl and N-allyl iminoacetonitriles 2a and 2b, respectively, beside small amounts of products 3a and 3b of their [1,3] prototropic shifts. It was found that the thermal fragmentation of the azetidine ring occurred fully regioselectively with a cleavage
顺式和反式1-苄基和1-烯丙基-2-氰基-3-苯基ze丁啶(1a和1b)在470°C的快速真空热解导致N-苄基和N-烯丙基亚氨基乙腈2a的E和Z异构体和图2b分别少量产品的旁图3a和3b中它们的[1,3]的质子移位。研究发现,氮杂环丁烷环的热断裂是通过C2-C3和C4-N键的裂解而完全区域选择性地发生的,而不是N-C2和C3-C4键的裂解。化合物的紫外光电子光谱借助于电离能的量子化学计算来测量和分析图2b。最简单的碳-氮双键在α,β取代时对电子结构的强烈修饰是由于腈基的吸电子作用和烯丙基的供体作用共同作用。