Organometallic Chemistry sans Organometallic Reagents: Modulated Electron‐Transfer Reactions of Subvalent Early Transition Metal Salts
作者:John J. Eisch、Xian Shi、Joseph R. Alila、Sven Thiele
DOI:10.1002/cber.19971300903
日期:1997.9
reductant, titanium dichloride, has been throughly examined, as well as the analogous ZrCl2 and HfCl2 reagents, all of which are readily obtainable by the alkylative reduction of the Group tetrachloride by butyllithium in THF. Noteworthy is that such interactions of MCl4 with butyllithium in hydrocarbon media lead, in contrast, to M(III) or M(IV) halide hydrides. Analogous alkylative reductions in THF
Nickel(O) -induced geminal bond cleavages leading to carbon-carbon double bonds: intermediacy of nickel(O) -carbene complexes as a unifying hypothesis
作者:John J. Eisch、Yun Qian、Mona Singh
DOI:10.1016/0022-328x(95)05948-o
日期:1996.4
bond cleavages of organic monomers with nickel(O) complexes to achieve olefinic dimers has been investigated both in stochiometric reactions between monomers of the tlype R2Ce2 and R2C=E and the complexes (Cod)2Ni, (Et3P)4Ni and (Bpy)Cod)Ni and in nickel(O)-catalytic α-elimination reactions of α-lithioorganic sulfones, RR′C(Li)(SO2R″). Substrates for the stoichiometric geminal bond cleavages comprised
已经在形式R 2 Ce 2和R 2 C = E的单体与配合物(Cod)2 Ni的化学计量反应中研究了用镍(O)配合物实现有机单体的双键断裂以实现烯烃二聚体的可能性。,(Et 3 P)4 Ni和(Bpy)Cod)Ni以及在镍(O)催化的α-硫代有机砜,RR'C(Li)(SO 2)的α消除反应中R”)。化学计量的双键断裂的底物包括双卤化物,氨基甲基硫化物,环丙烯,硫代酮和酮。在大多数情况下,包括在α-硫代有机砜的催化分解中,发现还原二聚为烯烃或其羟基衍生物的程度不同。因此,该方法在有机合成中提供了可观的前景。涵盖了全部已知的镍(0)化学成分,化学捕获结果和光谱学证据,以支持这样的提议,即双键断裂和还原偶联过程最有可能通过R 2型镍(0)-卡宾中间体进行C = Ni·L n。
Functionalized organolithium reagents. 10. Synthesis of amines via carbon-sulfur bond cleavages of substituted aminomethyl sulfides with organolithium reagents: aminocarbene route to enamines and sterically hindered amines