作者:Christopher J. Byrne、Demetrius Christoforou、Duncan A. R. Happer、Michael P. Hartshorn
DOI:10.1039/p29880000147
日期:——
Hammett σm and σp values have been determined for the phenyl-ONN-azoxy and phenyl-NNO-azoxy groups by measuring the pKa values of the phenylazoxybenzoic acids in 50% ethanol. The σp+ value for phenyl-ONN-azoxy has been evaluated both from the rate of solvolysis of 4-phenyl-ONN-azoxyphenyldimethylcarbinyl chloride in aqueous acetone, and from the rate of bromination by acidified hypobromous acid. The
哈米特σ米和σ p值已被确定为苯基ONN -azoxy和苯基NNO -azoxy基团通过测量在p ķ一个的phenylazoxybenzoic酸值在50%乙醇。的σ p +为苯基值ONN -azoxy已经从溶剂分解的速率评估二者-4-苯基ONN -azoxyphenyldimethylcarbinyl酰氯在含水丙酮中,从溴化的由酸化次溴酸的速率。获得的两个值明显不同,并且根据两个反应的过渡态的几何形状的差异来解释变化。