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