Air-Stable α-Diimine Nickel Precatalysts for the Hydrogenation of Hindered, Unactivated Alkenes
作者:Nadia G. Léonard、Paul J. Chirik
DOI:10.1021/acscatal.7b03909
日期:2018.1.5
isotopologues of the alkanes, signaling chain running processes that are competitive with productive hydrogenation. Stoichiometric studies, titration, and deuterium labeling experiments identified that the borane reagent served the dual role of reducing nickel(II) bis(carboxylate) to the previously reported nickel hydride dimer [(iPrDI)NiH]2 and increasing the observed hydrogenation activity. Performing the
空气稳定的双(辛酸镍(II)镍(II),Ni(O 2 CC 7 H 15)2和α-二亚胺配体,iPr DI或Cy ADI(iPr DI = [2,6- i Pr 2 -C 6 H ^ 3 N = C(CH 3)] 2,赛扬ADI = [C 6 H ^ 11 N = C(CH 3)] 2)与频哪醇硼烷(HBPin)生成用于氢化受阻,基本未官能化的烯烃的高活性催化剂。氢化了一系列的三和四取代的烯烃,并证明了以数克为单位的1-苯基-1-环己烯氢化的台式操作程序,代表了这种挑战性类别的镍催化氢化反应的催化剂活性和范围的进步。烯烃。用iPr DI用原位生成的镍催化剂对1,2-二甲基茚进行氘化可独家提供1,2- syn - d 2-二甲基茚满。使用环状三取代烯烃(例如1-甲基茚和甲基环己烯),在D 2的4 atm下用原位生成的镍催化剂进行氘化产生了烷烃的多个氘代同位素,这标志着与生产性氢化竞争的链运行