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- W2554163695 abstract "Abstract The formation of ArSY (Y: C(= S)NMe 2 , Ph, P(= O)(OEt) 2 ) by reductive elimination from σ‐aryl complexes (M(PPh 3 ) 2 PhBr, M = Ni, Pd), associated with disulfides (YS−SY, Y: C(=S)NMe 2 ( 1 ), Ph ( 2 ), P(=O)(OEt) 2 ( 3 )), at ambient temperature, has been investigated. Various mechanistic features of disulfide bond (S−S) cleavage have been elucidated using disulfide 1 by 31 P NMR spectroscopy and matrix‐assisted laser desorption/ionization–time of flight mass spectrometric investigations. Based upon the results of nucleophilic cleavage of the S−S bond by PPh 3 , studies of the reductive elimination process show that when M(PPh 3 ) 2 PhBr is mixed with disulfide 1 , competitive reactions occur between the PPh 3 ligand, disulfide 1 and a trace amount of water, leading to low C−S coupling yields; an oxidation reaction of PPh 3 with disulfide and water occur prior to C−S cross‐coupling, and phosphonium ion intermediates are likely involved. However, when the disulfide 1 is pretreated with PPh 3 , the Ni(II) σ‐aryl complex affords the C−S coupling product nearly quantitatively at room temperature. The pretreatment method is also effective for the coupling reaction of disulfide 2 and Ni(II) σ‐aryl complex. The difference between Ni(II) and Pd(II) σ‐aryl complexes on C−S bond formation by reductive elimination can be explained by the affinity of metal for the thiolate ligands derived from the cleaved disulfide. Copyright © 2013 John Wiley & Sons, Ltd." @default.
- W2554163695 created "2016-11-30" @default.
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- W2554163695 date "2013-10-31" @default.
- W2554163695 modified "2023-09-26" @default.
- W2554163695 title "Room-temperature carbon-sulfur bond formation from Ni(II) σ-aryl complex via cleavage of the S-S bond of disulfide moieties" @default.
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- W2554163695 doi "https://doi.org/10.1002/aoc.2975" @default.
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