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Reactivity of nickel metal precursors towards amido linked N-heterocyclic carbenes and their catalytic studies for cross coupling reactions

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Suryakant Nagar, Sucheta Chatterjee, Dibakar Goswami, David B. Cordes, A.M.Z. Slawin, Rohit Singh Chauhan, Pradnya Prabhu

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The refluxing of chloroacetamide derivatives with n-butyl imidazole resulted in their corresponding salt of composition 1-(n-butyl)-3-N-(2-Ar)acetamido-1, 3-imidazolium chloride (Ar = furylmethyl (1a); phenylmethyl (1b)). The latter salt on treatment with DBU followed by the addition of chalcogen atom resulted into a compound [(1-(n-butyl)-3-N-(2-Ar)acetamido-1,3-imidazol-3-ylidine)E] (Ar = furylmethyl; E = S (2a); Ar = phenylmthyl; E = Se (2b)). Similarly, the reaction of the imidazolium salts with, excess K2CO3 and NiCl2·6H2O yielded compounds [(1-(n-butyl)-3-N-(2-Ar)acetamido-1,3-imidazol-3-ylidine)]2Ni (Ar = furylmethyl (3a); phenylmethyl (3b)). The latter complexes have also been isolated by using Ni(II) phosphine precursors [NiCl2(PP)] (PP = PPh3, dppf). The molecular structure of [(1-(n-butyl)-3-N-(2-furylmethyl)acetamido-1, 3-imidazol-3-ylidine)]2Ni and [(1-(n-butyl)-3-N-(2-phenylmethyl)acetamido-1, 3-imidazol-3-ylidine)]2Ni were established by single crystal X-ray diffraction analysis. The catalytic property of complex 3a and 3b for cross coupling reactions has been studied.


Original languageEnglish
Article number119446
JournalInorganica Chimica Acta
Early online date18 Jan 2020
Publication statusE-pub ahead of print - 18 Jan 2020

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