作者:Georgios C. Vougioukalakis、Manolis M. Roubelakis、Mariza N. Alberti、Michael Orfanopoulos
DOI:10.1002/chem.200800920
日期:2008.10.29
The influence of the solvent on the triazolinedione-alkene ene reaction mechanism has been investigated. Both inter- and intramolecular kinetic isotope effects with tetramethylethylenes and 2,2,2-(trideuterio)methyl-7-methyl-2,6-octadiene-[D3]-1,1,1 provide, for the first time, strong evidence for changes in the mechanism of the reaction on going from non-protic to polar protic solvents. In non-protic
研究了溶剂对三唑啉二酮-烯烃反应机理的影响。四甲基乙烯和2,2,2-(三苯甲基)甲基-7-甲基-2,6-辛二烯-[D3] -1,1,1的分子间和分子内动力学同位素效应首次提供了有力的证据从非质子到极性质子溶剂的反应机理的变化。在非质子性极性或非极性溶剂中,在反应的第一个速率确定步骤中不可逆转地形成与开放中间体(偶极或双极性双极性)微不足道程度平衡的叠氮酰亚胺。氢提取。相反,在极性质子溶剂中,氢的提取是限速的,