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IJC-A Vol.48A [2009] >
IJC-A Vol.48A(05) [May 2009] >


Title: Copper(II) catalysed oxidation of alcohols in aqueous medium
Authors: Sarmah, Purabi
Barman, Rama K
Purkayastha, Pratyush
Bora, Sanchay J
Phukan, Prodeep
Das, Birinchi K
Keywords: Coordination polymers
Homogeneous catalysis
Catalysis
Oxidations
TBHP oxidations
Alcohol oxidations
Copper
Aqueous solvents
Issue Date: May-2009
Publisher: CSIR
IPC CodeInt. Cl.8 C07B33/00; C07F1/08
Abstract:  An environmentallly friendly, homogeneous catalytic method for the oxidation of alcohols in aqueous medium is described. The copper(II) complex, [Cu(4-CNpy)2Cl2]n, has been prepared in excellent yield and characterized by the single crystal X-ray diffraction technique. It crystallizes in the monoclinic space group P21/n with unit cell parameters a = 3.589(3)Å, b = 25.903(6) Å, c = 7.116(1)Å, β = 96.05(4)°, V = 657.9(6) Å3, and Z = 2. The crystal structure refinement yields final R1 = 0.0604, wR2 = 0.1577 and GooF = 1.055 for all 1423 unique reflections and 105 L.S. parameters. The results of crystal structure analysis show that the copper(II) compound is a one dimensional coordination polymer containing chloride ions as the bridging ligands forming one weak [Cu-Cl = 2.870(2) Å] and one strong [Cu-Cl = 2.333(1) Å] coordination bond with copper(II) centres. The Cu(II) complex (2 mol%) shows very good catalytic activity towards oxidation of alcohols under homogeneous condition using aqueous TBHP as the oxidant in H2O:MeCN (5:1 v/v). Products have been isolated in moderate to high yields either as aldehydes or ketones using the above green protocol.
Page(s): 637-644
ISSN: 0376-4710
Source:IJC-A Vol.48A(05) [May 2009]

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