Flash Photolytic Generation of Primary, Secondary, and Tertiary Ynamines in Aqueous Solution and Study of Their Carbon-Protonation Reactions in That Medium
作者:Y. Chiang、A. S. Grant、A. J. Kresge、S. W. Paine
DOI:10.1021/ja9601797
日期:1996.1.1
secondary ynamines. Solvent isotope effects and the form of acid−base catalysis show that the acid-catalyzed path involves formation of keteniminium ions by rate-determining proton transfer to the β-carbon atoms of the ynamines. The ions generated from primary and secondary ynamines then lose nitrogen-bound protons to give ketenimines, and the ketenimines obtained from secondary ynamines are hydrated
一组九种苯胺(PhC⋮CNH2、PhC⋮CNHCH(CH3)2、PhC⋮CNHC6H11、PhC⋮CNHC6H5、PhC⋮CNHC6F5、PhC⋮CN(CH2)5、PhC⋮CN(CH2CH2)2O、PhC⋮CNHC6H5 CH2CH2CN)2 和PhC⋮CN(CH3)C6F5) 是在水溶液中通过相应苯基氨基环丙烯酮的闪光光解脱羰产生的,并研究了它们在该介质中容易衰变的动力学。这种衰变由所有ynaminesprimary、secondary和叔的酸以及伯和仲ynamines的碱催化。溶剂同位素效应和酸碱催化的形式表明,酸催化路径涉及通过决定质子转移到 ynamines 的 β-碳原子的速率来形成 keteniminium 离子。由一级和二级 ynamines 产生的离子然后失去与氮结合的质子,得到 ketenimines,由仲ynamines得到的烯酮亚胺水合为苯乙酰胺,而从primary