BECKMANN-Umlagerung und Fragmentierung. 1. Teil. Mechanismus sowie Nachweis der Zwischenstufen Fragmentierungsreaktionen. 7. Mitteilung
作者:C. A. Grob、H. P. Fischer、W. Raudenbusch、J. Zergenyi
DOI:10.1002/hlca.19640470411
日期:——
The mechanism of the BECKMANN rearrangement and the fragmentation of ketoximes 1 has been studied by determining rate constants and products in «80%» ethanol of several anti-alkyl-, -cycloalkyl-, -aralkyl- and -phenyl-ketoxime tosylates with stationary syn-methyl and -phenyl substituents. The ratio of fragmentation to amide formation is not related to reaction rate, but increases with the stability
贝克曼重排和酮肟1的碎片的机制进行了研究,通过确定在数“80%”乙醇的速率常数和产品抗烷基- , -环烷基- ,和-aralkyl- -苯基-酮肟甲苯磺酸酯与静止的顺-甲基和-苯基取代基。裂解与酰胺形成的比例与反应速率无关,但随所形成的碳鎓离子R +的稳定性而增加,这由相应的烷基氯化物RC1的溶剂分解速率所反映。因此,在决定速率的迁移步骤之后会发生腈的碎裂。