A new aspect of nickel-catalyzed Grignard cross-coupling reactions: selective synthesis, structure, and catalytic behavior of a T-shape three-coordinate nickel(i) chloride bearing a bulky NHC ligand
A new aspect of nickel-catalyzed Grignard cross-coupling reactions: selective synthesis, structure, and catalytic behavior of a T-shape three-coordinate nickel(i) chloride bearing a bulky NHC ligand
Nickel-Catalyzed Reductive Cycloisomerization of Enynes with CO<sub>2</sub>
作者:Justin B. Diccianni、Tyler Heitmann、Tianning Diao
DOI:10.1021/acs.joc.7b01034
日期:2017.7.7
carboxylates from petroleum feedstock require a series of oxidation reactions. CO2 represents a cheap and sustainable, preoxidized C1 source. Herein, we describe a simple, selective, and mild procedure for the construction of (hetero)cyclic α,β-unsaturated carboxylic acids from 1,6- and 1,7-enyes and CO2. Terminal 1,7-enynes and stericallyhindered alkenes experience a change in regioselectivity and form
Synthesis, structures, and catalytic reactivity of bis(N-heterocyclic carbene) supported diphenyldiazomethane and 1-azidoadamantane complexes of nickel
作者:Nicole D. Harrold、Amanda R. Corcos、Gregory L. Hillhouse
DOI:10.1016/j.jorganchem.2016.03.031
日期:2016.7
the metal in a side-bound η2-fashion. While thermolysis of 3 and 4 does not induce N2 loss to form terminal carbenes and imidos, respectively, (IMes)2Ni(κ1-N2CPh2) (3-IMes) reacts with olefins at elevated temperatures to give cyclopropane products in excellent yields. Either 3-IMes or 1-IMes can also perform this reaction catalytically with a 1:1 ratio of diphenyldiazomethane to olefin. An olefin activation
Linear-Selective Hydroarylation of Unactivated Terminal and Internal Olefins with Trifluoromethyl-Substituted Arenes
作者:Joseph S. Bair、York Schramm、Alexey G. Sergeev、Eric Clot、Odile Eisenstein、John F. Hartwig
DOI:10.1021/ja505579f
日期:2014.9.24
alkylarenes from internal alkenes occurs by initial establishment of an equilibrating mixture of alkene isomers, followed by addition of the arene to the terminal alkene. Computational (DFT) studies imply that the aryl C-H bond transfers to a coordinated alkene without oxidative addition and support the conclusion from experiment that reductive elimination is rate-determining and forms the anti-Markovnikov
One-Pot, Single-Step, and Gram-Scale Synthesis of Mononuclear [(η<sup>6</sup>-arene)Ni(N-heterocyclic carbene)] Complexes: Useful Precursors of the Ni<sup>0</sup>–NHC Unit
N-heterocyclic carbenes (NHCs) has been paid special attention because of its high reactivity toward bond-forming reactions and the activation of unreactive bonds. Thus, it would be very worthwhile to provide a highly reactive, easily accessible, and versatile Ni0–NHC precursor. Herein we report a one-pot, single-step, and gram-scale method for the synthesis of [(η6-arene)Ni(NHC)] complexes from commercially
An Unsaturated Nickel(0) NHC Catalyst: Facile Preparation and Structure of Ni(0)(NHC)<sub>2</sub>, Featuring a Reduction Process from Ni(II)(NHC)(acac)<sub>2</sub>
A facile synthetic route to Ni(0)(NHC)2 from stable Ni(II)(acac)2 was established without common but labile Ni(0) precursors. The intermediate is a divalent mono-NHC adduct of Ni(acac)2, Ni(NHC)(acac)2. Reduction of Ni(NHC)(acac)2 in both the presence and absence of an NHC ligand gave Ni(NHC)2 in ca. 90% and 40% conversions, respectively. Ni(NHC)2, especially with bis(2,6-diisopropylphenyl)imidazolin-2-ylidene