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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
TBHP oxidations
Alcohol oxidations
Aqueous solvents
Issue Date: May-2009
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>8</sup> C07B33/00; C07F1/08
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> An environmentallly friendly, homogeneous catalytic method for the oxidation of alcohols in aqueous medium is described. The copper(II) complex, [Cu(4-CNpy)<sub>2</sub>Cl<sub>2</sub>]<sub>n</sub>, has been prepared in excellent yield and characterized by the single crystal X-ray diffraction technique. It crystallizes in the monoclinic space group P2<sub>1</sub>/n with unit cell parameters <i>a</i> = 3.589(3)Å, <i>b</i> = 25.903(6) Å, <i>c</i> = 7.116(1)Å, β<smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> <i style=""> </i>= 96.05(4)°<i>, V</i> = 657.9(6) Å<sup>3</sup>, and <i>Z</i> = 2.<b> </b>The crystal structure refinement yields final R1 = 0.0604, <i>w</i>R2 = 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%)<b style=""> </b>shows very good catalytic activity towards oxidation of alcohols under homogeneous condition using aqueous TBHP as the oxidant in H<sub>2</sub>O:MeCN (5:1 <i>v/v</i>). Products have been isolated in moderate to high yields either as aldehydes or ketones using the above green protocol. </smarttagtype></smarttagtype>
Description: 637-644
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.48A(05) [May 2009]

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