Chemistry - Research Publications

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End date: 2020Subject: search.filters.subject.Copper

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    Chitosan-supported copper as an efficient and recyclable heterogeneous catalyst for A3/decarboxylative A3-coupling reaction
    (Elsevier Ltd, 2018) Kaur, Pavneet; Kumar, Bhupinder; Kumar, Vinod; Kumar, Rakesh
    Chitosan-supported copper (chit@copper) based heterogeneous catalysts have been explored for A3-coupling and decarboxylative A3-coupling. The developed protocol employs low catalyst loading, solventless condition and easy work-up for the synthesis of diversely substituted propargylamines. More importantly, the catalyst could be recovered and reused without any significant loss in the activity. This offer huge advantages as recyclability issues are rarely addressed in decarboxylative A3-coupling. Leaching studies were carried out using AAS and ICPMS analysis. It is envisaged that chit@copper catalysts can have potential applications in terms of efficiency and recyclability in the emerging area of decarboxylative C?H bond activation/functionalization strategies. ? 2018 Elsevier Ltd
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    Diselenophosphate-Induced Conversion of an Achiral [Cu20H11 {S2P (OiPr) 2} 9] into a Chiral [Cu20H11 {Se2P (OiPr) 2} 9] Polyhydrido Nanocluster.
    (Wiley, 2015) Rajendra S. Dhayal.; Jian-Hong Liao.; Xiaoping Wang.; Yu-Chiao Liu.; Ming-His Chiang.; Samia Kahlal.; Jean-Yves Saillard.; C. W. Liu
    A polyhydrido copper nanocluster, [Cu20H11{Se2P(OiPr)2}9] (2H), which exhibits an intrinsically chiral inorganic core of C3 symmetry, was synthesized from achiral [Cu20H11{S2P(OiPr)2}9] (1H) of C3h symmetry by a ligand?exchange method. The structure has a distorted cuboctahedral Cu13 core, two triangular faces of which are capped along the C3 axis, one by a Cu6 cupola and the other by a single Cu atom. The Cu20 framework is further stabilized by 9 diselenophosphate and 11 hydride ligands. The number of hydride, phosphorus, and selenium resonances and their splitting patterns in multinuclear NMR spectra of 2H indicate that the chiral Cu20H11 core retains its C3 symmetry in solution. The 11 hydride ligands were located by neutron diffraction experiments and shown to be capping ?3?H and interstitial ?5?H ligands (in square?pyramidal and trigonal?bipyramidal cavities), as supported by DFT calculations on [Cu20H11(Se2PH2)9] (2H?) as a simplified model.