Fragmentation of 2,2,2-Triphenylethoxychlorocarbene: Evidence for Ultrafast Fragmentation−Rearrangement in Excited Diazirines
作者:Xiaolin Fu、Robert A. Moss、Piotr Piotrowiak、Mykhaylo Myahkostupov、Ian R. Gould
DOI:10.1021/ol061863l
日期:2006.10.1
[reaction: see text] Photolysis of 3-(2,2,2-triphenylethoxy)-3-chlorodiazirine gives 2,2,2-triphenylethoxychlorocarbene which fragments with 1,2-phenyl migration and loss of CO and Cl(-) to yield the 1,1,2-triphenylethyl cation and thence 1,1,2-triphenylethene by proton loss. However, ps and fs laser flash photolysis provides evidence that up to 25% of the alkene product stems from carbocation that
[反应:请参见文本] 3-(2,2,2-三苯基乙氧基)-3-氯二嗪的光解得到2,2,2-三苯基乙氧基氯卡宾,该片段裂解为1,2-苯基迁移,CO和Cl(-)损失为通过质子损失产生1,1,2-三苯乙基阳离子,然后得到1,1,2-三苯乙烯。然而,ps和fs激光闪光光解法提供了证据,表明多达25%的烯烃产物来自碳正离子化,而碳正离子化直接是由激发的二嗪胺而不是碳烯引起的。