Towards a Comprehensive Hydride Donor Ability Scale
作者:Markus Horn、Ludwig H. Schappele、Gabriele Lang-Wittkowski、Herbert Mayr、Armin R. Ofial
DOI:10.1002/chem.201202839
日期:2013.1.2
Rates of hydride transfer from several hydridedonors to benzhydrylium ions have been measured at 20 °C and used for the determination of empirical nucleophilicity parameters N and sN according to the linear free energy relationship log k20 °C=sN(N+E). Comparison of the rate constants of hydride abstraction by tritylium ions with those calculated from the reactivity parameters sN, N, and E showed fair
hydrogenation reactions catalyzed by frustrated Lewis pairs, were synthesized in high yield under mild conditions from triaryl boranes, ammonium or phosphonium halides, and triethylsilane. The kinetics and mechanisms of the reactions of these hydridoborate salts with benzhydrylium ions, iminium ions, quinone methides, and Michael acceptors were investigated, and their nucleophilicity was determined and compared