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Synthesis, Characterization, and Efficient Catalytic Activities of a Nickel(II) Porphyrin: Remarkable Solvent and Substrate Effects on Participation of Multiple Active Oxidants.
Ahn, Hye Mi; Bae, Jeong Mi; Kim, Min Jeong; Bok, Kwon Hee; Jeong, Ha Young; Lee, Suk Joong; Kim, Cheal.
Afiliação
  • Ahn HM; Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, 139-743, Korea.
  • Bae JM; Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, 139-743, Korea.
  • Kim MJ; Department of Chemistry, Korea University, Seoul, 136-701, Korea.
  • Bok KH; Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, 139-743, Korea.
  • Jeong HY; Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, 139-743, Korea.
  • Lee SJ; Department of Chemistry, Korea University, Seoul, 136-701, Korea.
  • Kim C; Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, 139-743, Korea.
Chemistry ; 23(49): 11969-11976, 2017 Sep 04.
Article em En | MEDLINE | ID: mdl-28731593
A new nickel(II) porphyrin complex, [NiII (porp)] (1), has been synthesized and characterized by 1 H NMR, 13 C NMR and mass spectrometry analysis. This NiII porphyrin complex 1 quantitatively catalyzed the epoxidation reaction of a wide range of olefins with meta-chloroperoxybenzoic acid (m-CPBA) under mild conditions. Reactivity and Hammett studies, H218 O-exchange experiments, and the use of PPAA (peroxyphenylacetic acid) as a mechanistic probe suggested that participation of multiple active oxidants NiII -OOC(O)R 2, NiIV -Oxo 3, and NiIII -Oxo 4 within olefin epoxidation reactions by the nickel porphyrin complex is markedly affected by solvent polarity, concentration, and type of substrate. In aprotic solvent systems, such as toluene, CH2 Cl2 , and CH3 CN, multiple oxidants, NiII -(O)R 2, NiIV -Oxo 3, and NiIII -Oxo 4, operate simultaneously as the key active intermediates responsible for epoxidation reactions of easy-to-oxidize substrate cyclohexene, whereas NiIV -Oxo 3 and NiIII -Oxo 4 species become the common reactive oxidant for the difficult-to-oxidize substrate 1-octene. In a protic solvent system, a mixture of CH3 CN and H2 O (95:5), the NiII -OOC(O)R 2 undergoes heterolytic or homolytic O-O bond cleavage to afford NiIV -Oxo 3 and NiIII -Oxo 4 species by general acid catalysis prior to direct interaction between 2 and olefin, regardless of the type of substrate. In this case, only NiIV -Oxo 3 and NiIII -Oxo 4 species were the common reactive oxidant responsible for olefin epoxidation reactions.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article