Synthesis, characterization, and norbornene polymerization of η3-benzylnickel(II) complexes of N-heterocyclic carbenes

Sujith, S.; Noh, Eun Kyung; Lee, Hyun Ju; Han, Jin Wook

doi:10.1016/j.jorganchem.2008.03.026

Cited by 48 publications

(21 citation statements)

References 42 publications

(60 reference statements)

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“…Lastly, the complexes (308), [117] (326) [48] and (327−332) [111] were obtained from other Ni(II)−NHC complexes using various reagents namely, NaI, CO 2 , B(C 6 F 5 ) 3 , AgCF 3 CO 2 and AgCF 3 SO 3 (Scheme 16 and Figure 22). The transmetallation route is not known for these complexes.…”

Section: Neutral [(Nhc)(allyl)nix] (X = Anion) Type Complexesmentioning

confidence: 99%

“…The complexes (341), [124] (360), [306] (548), [306] (557), [306] (570−573), [174] (574), [175] (622−623), [306] (677) [204] and (785) [175] catalyzed norbornene polymerization in the presence of MAO. The complexes (327−332) [111] polymerized norbornene directly in the absence of any activator.…”

Section: Norbornene Polymerizationmentioning

confidence: 99%

“…Oxidation method [Method (IV)]:The oxidation of nickel(0)−NHC complexes by bond activation reaction, chemical oxidation reaction and oxidative addition reactions were successfully used for preparing the nickel(I)−NHC complexes (Scheme 10). Representative method for the preparation of Ni(I)−NHC complexes from the Ni(0)−NHC complexes by the oxidation method.A binuclear Ni(I) complex(111) containing symmetrically bridged tert-butylimidazol-2-ylidene ligands was obtained through the bond activation of a imidazolylidene ring in the reaction of the nickel(0) precursor, Ni(COD) 2 and a free NHC ligand[26]. The chelating tris-carbene (NHC) Ni(0) complex (6) upon oxidation led to the corresponding triscarbene (NHC) Ni(I) complex (112)[22].…”

mentioning

confidence: 99%

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Nickel N-heterocyclic carbene complexes and their utility in homogeneous catalysis

Prakasham

Ghosh

2015

Inorganica Chimica Acta

116

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Section: Neutral [(Nhc)(allyl)nix] (X = Anion) Type Complexesmentioning

confidence: 99%

Section: Norbornene Polymerizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Nickel N-heterocyclic carbene complexes and their utility in homogeneous catalysis

Prakasham

Ghosh

2015

Inorganica Chimica Acta

116

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“…More recently, Sujith et al [21] reported neutral and cationic η 3 -benzylnickel(II) complexes bearing one bulky imidazole-based carbene, which were found to be active norbornene polymerization catalysts, even without co-catalyst. The highest activity observed with this type of complex was 3.3 × 10 5 g (mol cat) −1 h −1 (1:Ni = 5000, 20 min at 130…”

Section: Catalytic Studiesmentioning

confidence: 99%

“…These concern a complex with two picolyl-functionalized N-heterocyclic carbene (NHC) ligands, [20] and a nickel compound bearing one bulky monodentate NHC and one η 3 -coordinated benzyl moiety. [21] N-heterocyclic carbenes are increasingly used in homogeneous catalysis as stable, versatile spectator ligands. Some excellent reviews describe a large number of reactions in which these strong σ -donor ligands have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Nickel N‐heterocyclic carbene complexes in the vinyl polymerization of norbornene

Berding

Lutz

Spek

et al. 2010

Applied Organom Chemis

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Vinyl polymerized norbornene has some useful properties such as good mechanical strength, optical transparency and heat resistance. Several transition metal complexes have been described in the literature as active catalysts for the vinyl polymerization of norbornene. We now report the use of three types of nickel(II) complexes with N-heterocyclic carbene (NHC) ligands in the catalytic vinyl polymerization of norbornene under a range of conditions. Specifically, two nickel complexes bearing a chelating bis(NHC) ligand, two nickel complexes bearing two chelating anionic N-donor functionalized NHC ligands as well as one diiodidonickel(II) complex with two monodentate NHC ligands were tested. The solid-state structure of bis(1,3-dimethylimidazol-2-ylidene)diiodidonickel(II), as determined by X-ray crystallography, is presented. The highest polymerization activity of 2.6 × 10 7 g (mol cat) −1 h −1 was observed using the latter nickel complex as catalyst, activated by methylaluminoxane. The norbornene polymers thus obtained are of high molecular weight but with rather low polydispersity.

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Nickel, [1,3-bis[2,6-bis(1-methylethyl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene]dichloro(triphenylphosphine)-, (SP-4-1)-

Mori

2016

Encyclopedia of Reagents for Organic Synthesis

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Synthesis, characterization, and norbornene polymerization of η3-benzylnickel(II) complexes of N-heterocyclic carbenes

Cited by 48 publications

References 42 publications

Nickel N-heterocyclic carbene complexes and their utility in homogeneous catalysis

Nickel N-heterocyclic carbene complexes and their utility in homogeneous catalysis

Nickel N‐heterocyclic carbene complexes in the vinyl polymerization of norbornene

Nickel, [1,3-bis[2,6-bis(1-methylethyl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene]dichloro(triphenylphosphine)-, (SP-4-1)-

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