Absence of internal return in the reaction of (4-nitrophenyl)nitromethane with amine bases in toluene solution. Implication on unusually large isotope effects reported for this reaction
作者:A. J. Kresge、M. F. Powell
DOI:10.1021/ja00391a043
日期:1981.1
Very large isotope effects have been reported for the acid ionization of (4-nitrophenyl)nitromethane in nonpolar solvents in the presence of strongly basic amine proton acceptors. Rates of tritium exchange were studied, and internal return was found to be absent. The very large isotope effect reported for tetramethylguanidine (45) is reduced to 14, but this is still large and could signify some proton
据报道,在强碱性胺质子受体存在下,(4-硝基苯基)硝基甲烷在非极性溶剂中的酸离子化会产生非常大的同位素效应。研究了氚交换率,发现没有内部回报。报道的四甲基胍 (45) 的非常大的同位素效应减少到 14,但这仍然很大,可能意味着一些质子隧穿。(DLC)