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• W2000461729 endingPage "13183" @default.
• W2000461729 startingPage "13175" @default.
• W2000461729 abstract "The ability of the terpyridine ligand to stabilize alkyl complexes of nickel has been central in obtaining a fundamental understanding of the key processes involved in alkyl−alkyl cross-coupling reactions. Here, mechanistic studies using isotopically labeled (TMEDA)NiMe2 (TMEDA = N,N,N‘,N‘-tetramethylethylenediamine) have shown that an important catalyst in alkyl−alkyl cross-coupling reactions, (tpy‘)NiMe (2b, tpy‘ = 4,4‘,4‘ ‘-tri-tert-butylterpyridine), is not produced via a mechanism that involves the formation of methyl radicals. Instead, it is proposed that (terpyridine)NiMe complexes arise via a comproportionation reaction between a Ni(II)−dimethyl species and a Ni(0) fragment in solution upon addition of a terpyridine ligand to (TMEDA)NiMe2. EPR and DFT studies on the paramagnetic (terpyridine)NiMe (2a) both suggest that the unpaired electron resides heavily on the terpyridine ligand and that the proper electronic description of this nickel complex is a Ni(II)−methyl cation bound to a reduced terpyridine ligand. Thus, an important consequence of these results is that alkyl halide reduction by (terpyridine)NiRalkyl complexes appears to be substantially ligand based. A comprehensive survey investigating the catalytic reactivity of related ligand derivatives suggests that electronic factors only moderately influence reactivity in the terpyridine-based catalysis and that the most dramatic effects arise from steric and solubility factors." @default.
• W2000461729 created "2016-06-24" @default.
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• W2000461729 date "2006-09-19" @default.
• W2000461729 modified "2023-10-16" @default.
• W2000461729 title "Ligand Redox Effects in the Synthesis, Electronic Structure, and Reactivity of an Alkyl−Alkyl Cross-Coupling Catalyst" @default.
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• W2000461729 doi "https://doi.org/10.1021/ja063334i" @default.
• W2000461729 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17017797" @default.
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