作者:Chau Ha、Osama M. Musa、Felix N. Martinez、Martin Newcomb
DOI:10.1021/jo962396w
日期:1997.5.1
yl radical (8) in the presence of the Lewis acids LiBF(4), MgBr(2), and BF(3) were measured by laser flash photolysis (LFP) methods. The LFP studies demonstrated saturation kinetic behavior with respect to the Lewis acids. Equilibrium binding constants for the Lewis acids with the dialkylaminyl radicals and rate constants for reactions of the Lewis acid complexed dialkylaminyl radicals were obtained
定性和定量地证明了路易斯酸的活化和二烷基氨基自由基反应的催化作用。N-丁基-4-戊烯基自由基(1)在多种路易斯酸存在下的环化反应是有效的,即使在-78摄氏度下进行的反应中,环状产物的收率也很高至极好。速率常数N-乙基-2,2-二苯基乙基氨基残基的片段化(6),N-甲基-6,6-二苯基-5-己基氨基自由基(7)的6-exo环化和N的5-exo环化路易斯酸LiBF(4),MgBr(2)和BF(3)存在的情况下,通过激光闪光光解(LFP)方法测量了-甲基-5,5-二苯基-4-戊胺基(8)。LFP研究证明了相对于路易斯酸的饱和动力学行为。