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Reversible C-CN Bond Cleavage by a Formal Dinickel(I) Hydride Cation
Yu Cao1, Neil A Dodd1, John Bacsa1,2
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States.
Abstract:
An N-heterocyclic carbene (NHC) ligand supports a stable [Ni2H]+ core, formally dinickel(I). This diamagnetic cation complex features a bent hydride bridge and a Ni···Ni distance, 2.9926(5) Å, larger than two covalent radii. The cation displays weakly protic character, undergoing deprotonation by strong base to form the corresponding (NHC)nickel(0) dimer. Its reaction with aliphatic nitriles results in C-CN bond cleavage. The organic products of this reaction suggest that this bond-breaking step involves reactive nickel alkyl intermediates and occurs reversibly.
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