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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Probing stepwise reaction of NNP-ligand copper(I) complex with elemental sulfur by using N-heterocyclic carbene as a
1State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China.
Abstract:
The dinuclear NNP-ligand copper(I) complex [o-N═CH(C(4)H(3)N)-PPh(2)C(6)H(4)](2)Cu(2) (1) has been synthesized by the reaction of (CuMes)(4) (Mes = 2,4,6-Me(3)C(6)H(2)) with N-((1H-pyrrol-2-yl)-methylene)-2-(diphenylphosphino)benzenamine under an elimination of MesH. Further reaction of 1 with an excess of S(8) produced a mononuclear Cu(II) complex [o-N═CH(C(4)H(3)N)-P(S)Ph(2)C(6)H(4)](2)Cu (5) and CuS. CuS was identified by Raman spectroscopy and 1 and 5 were clearly confirmed by X-ray crystallography. The N-heterocyclic carbene was employed to react with 1 to give a mononuclear [o-N═CH(C(4)H(3)N)-PPh(2)C(6)H(4)]Cu{C[N(iPr)CMe](2)} (2). The reactions of 2 were carried out with (1)/(8), (2)/(8), and (5)/(8) equiv of S(8), leading to compounds [o-N═CH(C(4)H(3)N)-P(S)Ph(2)C(6)H(4)]Cu{C[N(iPr)CMe](2)} (3), [o-N═CH(C(4)H(3)N)-P(S)Ph(2)C(6)H(4)]Cu (4), and 5 respectively, in which CuS was generated in the third reaction and S═C[N(iPr)CMe](2) in the latter two reactions. The clean confirmation of 2-4 demonstrates a stepwise reaction process of 1 with S(8) to 5 and CuS and the N-heterocyclic carbene acts well as a trapping agent.
