| Nickel complexes incorporating an amido phosphine chelate with a pendant amine arm: Synthesis, structure, and catalytic Kumada coupling. | |
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MedLine Citation:
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PMID: 22124467 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A series of organonickel(ii) complexes incorporating an amido phosphine ligand tethered with an amino pendant have been prepared and characterized. Deprotonation of N-(dimethylaminoethyl)-2-diphenylphosphinoaniline (H[PNN]) with one equivalent of n-BuLi in ethereal or hydrocarbon solutions at -35 °C generates cleanly dimeric {Li[PNN]}(2) as yellow crystals. The reaction of NiCl(2)(DME) with {Li[PNN]}(2) in THF at -35 °C affords green crystalline [PNN]NiCl. Treating [PNN]NiCl with NaX in acetone solutions gives [PNN]NiX (X = Br, I). Alkylation or arylation of [PNN]NiCl with appropriate Grignard reagents in THF at -35 °C produces red crystalline [PNN]NiR (R = Me, Et, i-Bu, n-hexyl, CH(2)Ph, Ph). The chloride complex [PNN]NiCl was found to be an active catalyst precursor for Kumada coupling reactions of PhX (X = I, Br, Cl) with aryl or alkyl Grignard reagents, including those containing β-hydrogen atoms. The X-ray structures of {Li[PNN]}(2) and [PNN]NiX (X = Cl, Br, Me, Et, n-hexyl) are reported. |
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Authors:
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Lan-Chang Liang; Wei-Ying Lee; Yu-Ting Hung; Yi-Chen Hsiao; Liang-Chien Cheng; Wei-Chen Chen |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-29 |
Journal Detail:
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Title: Dalton transactions (Cambridge, England : 2003) Volume: - ISSN: 1477-9234 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101176026 Medline TA: Dalton Trans Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan. lcliang@mail.nsysu.edu.tw. |
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