The spin density in the nickel(II) radical salen complex (2*)(+) could be localized on a specific ring by controlling the acidity of the medium.
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http://dx.doi.org/10.1039/c0cc01775b | DOI Listing |
Adv Sci (Weinh)
October 2024
School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing National Laboratory for Molecular Sciences, Beijing, 100049, China.
Catalytic activation of C-O bonds is considered as a powerful strategy for the production of aromatics from lignin. However, due to the high reduction potentials of diaryl ether 4-O-5 linkage models, their single electron reduction remains a daunting challenge. This study presents the blue light-induced bifunctional N-heterocyclic carbene (NHC)-catalyzed one-electron reduction of diaryl ether 4-O-5 linkage models for the synthesis of trivalent phosphines.
View Article and Find Full Text PDFChemistry
August 2023
Institute for Molecular Science (IMS), Okazaki, Aichi, 444-8787, Japan.
Cross-pinacol coupling of two different carbonyl compounds was achieved through successive one-electron transfer processes under photocatalytic conditions. In the reaction, an umpoled anionic carbinol synthon was generated in situ to react nucleophilically with a second electrophilic carbonyl compound. It was revealed that a CO additive promoted the photocatalytic generation of the carbinol synthon to suppress undesired radical dimerization.
View Article and Find Full Text PDFInorg Chem
March 2022
Institute for Inorganic Chemistry, University of Duisburg-Essen, 45117 Essen, Germany.
Understanding the formation of metal-metal bonds and their electronic structures is still a scientific task. We herein report on the stepwise synthesis of boryl-substituted antimony compounds in which the antimony atoms adopt four different oxidation states (+III, +II, +I, +I/0). Sb-C bond homolysis of Cp*[(HCNDip)B]SbCl (; Cp* = CMe; Dip = 2,6-PrCH) gave diboryldichlorodistibane [(HCNDip)BSbCl] (), which reacted with KC to form diboryldistibene [(HCNDip)BSb] () and traces of cyclotetrastibane [(HCNDip)B]SbCl ().
View Article and Find Full Text PDFInorg Chem
January 2022
Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
Two linear tetradentate phosphine ligands, -PhPCHP(Ph)CHCHP(Ph)CHPPh ( = CH (-dpmppp), NBn (-dpmppmNBn; Bn = benzyl)) were utilized to synthesize unsymmetrical dinuclear Rh complexes, [RhCl(-dpmppp)(L)] (L = XylNC (), CO ()) and [RhCl(-dpmppmNBn)(L)] (L = XylNC (), CO ()), where electron-deficient Rh → Rh centers with 30 valence electrons are supported by a tetraphosphine in an unusual /- coordination mode. The Rh dimers of - were treated with HCl under air to afford the Rh → Rh dimers with 32 e, [RhCl(-dpmppp)(L)] (L = XylNC (), CO ()) and [RhCl(-dpmppmNBn)(L)] (L = XylNC (), CO ()), via intermediate hydride complexes, [{RhCl(μ-H)RhCl(L)}(-dpmppp)] (L = XylNC (), CO ()) and [{RhCl(μ-H)RhCl(L)}(-dpmppmNBn)] (L = XylNC (), CO ()), and [{Rh(H)Cl(μ-Cl)Rh(L)}-dpmppp)] (L = XylNC (), CO ()) and [{Rh(H)Cl(μ-Cl)Rh(L)}-dpmppmNBn)] (L = XylNC (), CO ()). The hydride intermediates and were monitored under nitrogen by H{P} and P{H} NMR techniques to reveal two reaction pathways depending on the terminal auxiliary ligand L.
View Article and Find Full Text PDFChem Sci
August 2020
Department of Chemistry, Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK.
Radical cations generated from the oxidation of C[double bond, length as m-dash]C π-bonds are synthetically useful reactive intermediates for C-C and C-X bond formation. Radical cation formation, induced by sub-stoichiometric amounts of external oxidant, are important intermediates in the Woodward-Hoffmann thermally disallowed [2 + 2] cycloaddition of electron-rich alkenes. Using density functional theory (DFT), we report the detailed mechanisms underlying the intermolecular heterodimerisation of anethole and β-methylstyrene to give unsymmetrical, tetra-substituted cyclobutanes.
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