Synthesis and properties of dialkyl complexes of nickel(<scp>II</scp>). The crystal structure of bis(pyridine)bis(trimethylsilylmethyl)nickel(<scp>II</scp>)
作者:Ernesto Carmona、Francisco González、Manuel L. Poveda、Jerry L. Atwood、Robin D. Rogers
DOI:10.1039/dt9810000777
日期:——
(L–L) gives [NiR2L2] or [NiR2(L–L)](L = PMe3 or PMe2Ph; L–L = Ph2PCH2CH2PPh2, 2,2′-bipyridyl, 1,10-phenanthroline, or NNN′N′-tetramethylethylenediamine), while PMePh2 and PPh3 cause reductive elimination to [NiL4]. Some neophyl analogues, [Ni(CH2CMe2Ph)2(L–L)] are also described. Structures for the new compounds are proposed on the basis of i.r., 1H, and 31P n.m.r. spectroscopic studies. Complexes [Ni(
Ligand Exchange Reactions of [(tmeda)NiR<sub>2</sub>] (R = CH<sub>2</sub>CMe<sub>3</sub>, CH<sub>2</sub>SiMe<sub>3</sub>, CH<sub>2</sub>CMe<sub>2</sub>Ph) with N-Heterocyclic Carbenes and Bidentate Phosphines
作者:Andreea Enachi、Matthias Freytag、Jan Raeder、Peter G. Jones、Marc D. Walter
DOI:10.1021/acs.organomet.0c00262
日期:2020.7.13
[(py)4NiR2] with Grignardreagents. With [(tmeda)NiR2] as the starting material, ligand exchange reactions with N-heterocyclic carbenes and bidentate phosphines were explored. The reaction of [(tmeda)NiR2] with IiPr2Me2 (IiPr2Me = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) yields three different classes of products: (a) [cis-(IiPr2Me2)2Ni(CH2SiMe3)2] (2a-cis) derived from NHC by tmeda replacement, (b) [
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