Factors Influencing the C−O Bond Homolysis of Alkoxyamines: Effects of H−Bonding and Polar Substituents
作者:Sylvain Marque、Hanns Fischer、Elisabeth Baier、Armido Studer
DOI:10.1021/jo001190z
日期:2001.2.1
discussed. A correlation by which the rate constant for the C-O bond cleavage of TEMPO-derived alkoxyamines can be predicted from the C-H BDEs of the corresponding alkanes is presented. Solvent effects as well as the effect of camphorsulfonic acid on the rate of the C-O bond homolysis are discussed. Finally, EPR and kinetic evidence show that alkoxyamines derived from nitroxides which are capable of intramolecular
描述了各种新的三烷基羟胺的合成。已经测量了这些新的烷氧基胺的CO键裂解的速率常数。例如,一系列对位取代的TEMPO-苯乙烯基化合物TEMPO-CH(CH3)C6H5X 1a(p-MeO),1b(p-Me),1d(pH),1e(p-Br)的CO键均质速率,并显示1f(p-MeO2C)。此外,讨论了α-杂芳基取代的仲烷氧基胺的CO键裂解的速率常数。提出了一种相关性,通过该相关性,可以从相应烷烃的CH BDE预测TEMPO衍生的烷氧基胺的CO键裂解速率常数。讨论了溶剂效应以及樟脑磺酸对CO键均质分解速率的影响。最后,