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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4022

Title: Rare [(NHC)(2)Ni-OH]-Type Terminal Nickel Hydroxo and [(NHC)(2)Ni]-Type Complexes of N/O-Functionalized N-Heterocyclic Carbenes as Precatalysts for Highly Desirable Base-Free Michael Reactions in Air at Ambient Temperature
Authors: SAMANTARAY, MK
SHAIKH, MM
GHOSH, P
Keywords: ring-opening polymerization
solvent-free conditions
cross-coupling reactions
1,3-dicarbonyl compounds
addition-reactions
catalytic-activity
nucleophile precursors
quaternary stereocenters
palladium complexes
mechanistic aspects
Issue Date: 2009
Publisher: AMER CHEMICAL SOC
Citation: ORGANOMETALLICS, 28(7), 2267-2275
Abstract: Highly convenient base-free Michael reaction of beta-dicarbonyl, beta-keto ester, and alpha-cyano ester compounds with activated ethylene compounds in air at ambient temperature catalyzed by a series of new nickel complexes, 1b-4b, of N/O-functionalized N-heterocyclic carbenes (NHC) are reported. Quite interestingly, of these nickel complexes, 1b and 2b were found to be of the [(NHC)(2)Ni-OH] type bearing a terminal [Ni-OH] moiety and are among the few known structurally characterized examples of monomeric terminal [Ni-OH] complexes. Compounds 3b and 4b, on the other hand, were found to be of the commonly encountered [(NHC)(2)Ni]-type complexes. More significantly, both the [(NHC)(2)Ni-OH] -type complexes 1b and 2b and the [(NHC)(2)Ni]-type complexes 3b and 4b were synthesized using same synthetic methodology by sheer modulation of the N-substituents on the N-heterocyclic carbene ring by the reaction of the imidazolium chloride salts with NiCl(2)center dot 6H(2)O in the presence of K(2)CO(3) as a base.
URI: http://dx.doi.org/10.1021/om801186f
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4022
http://hdl.handle.net/10054/4022
ISSN: 0276-7333
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