Matrix-IR Spectroscopic Investigations of the Thermolysis and Photolysis of Diazoamides
作者:Curt Wentrup、Hervé Bibas、Arvid Kuhn、Ullrich Mitschke、Mark C. McMills
DOI:10.1021/jo401695x
日期:2013.11.1
Matrix photolysis of N,N-dialkyldiazoacetamides 1a–d at 7–10 K results in either the formation of C–H insertion products (in case of N,N-dimethyl and N,N-diethyl diazoamides) or almost exclusive Wolff rearrangement to ketenes (in the case of the cyclic diazoamides N-(diazoacetyl)azetidine and N-(diazoacetyl)pyrrolidine). This can be ascribed to higher activation barriers for the approach of the singlet
的矩阵光解Ñ,Ñ -dialkyldiazoacetamides 1A - d在7-10ķ导致的C-H插入产物任一的形成(在以下情况下Ñ,ñ -二甲酯和Ñ,ñ -二乙基重氮酯)或几乎完全沃尔夫重排乙烯酮(在环状重氮酰胺N-(重氮乙酰基)氮杂环丁烷和N-(重氮乙酰基)吡咯烷的情况下)。这可以归因于更高的活化障碍为单峰卡宾P的轨道在方法5中的激发态(或重氮碳的1)以增强环状取代基中C–H键的牢固性和“束缚性”。相反,重氮的快速真空热解(FVT)1a – d排除了激发态的反应,从而产生纯净的C–H插入,而烯酮只有少量的Wolff重排。