Please use this identifier to cite or link to this item: https://doi.org/10.1002/ejic.200801149
Title: Formation of homoleptic tetracarbene versus m-Chelating dicarbene complexes of nickel(ii) and applications in kumada-Corriu couplings
Authors: Huynh, H.V. 
Jothibasu, R. 
Keywords: Autoionization
Carbene ligands
Chelates
Cross-coupling
Nickel
Issue Date: May-2009
Source: Huynh, H.V., Jothibasu, R. (2009-05). Formation of homoleptic tetracarbene versus m-Chelating dicarbene complexes of nickel(ii) and applications in kumada-Corriu couplings. European Journal of Inorganic Chemistry (13 SPEC. ISS.) : 1926-1931. ScholarBank@NUS Repository. https://doi.org/10.1002/ejic.200801149
Abstract: The formation of mono- versus bis(chelate) Ni11 complexes bearing N-heterocyclic dicarbene ligands can be controlled by the flexibility of the ligand bridge. A short methylene spacer exclusively gives rise to a dicationic bis(chelate) complex [Ni(MeCCmeth)2]Br2 (1), whereas a more flexible propylene spacer affords a neutral monochelate complex [NiBr2(MeCCprop)] (2). Complex 2 was found to autoionize very slowly to the corresponding dicationic bis(chelate) over ca. 45 d in [D6]dmso. The formation of the bis-versus mono-chelate complex can be attributed to the different stabilities of the resulting metallacycles. The catalytic activity of mono-chelate 2 was tested in the Kumada-Corriu coupling of aryl halides with arylmagnesium reagents at ambient temperature. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009.
Source Title: European Journal of Inorganic Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/76212
ISSN: 14341948
DOI: 10.1002/ejic.200801149
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