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Catalysis by Ir(III), Rh(III) and Pd(II) metal ions in the oxidation of organic compounds with H 2 O 2
Author(s) -
Tandon Praveen K.,
Sahgal Sumita,
Srivastava Manish,
Singh Santosh B.
Publication year - 2007
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1169
Subject(s) - benzaldehyde , chemistry , rhodium , catalysis , benzyl alcohol , cyclohexanol , palladium , cyclohexanone , organic chemistry , cinnamaldehyde , medicinal chemistry , inorganic chemistry
Abstract Catalytic activities of three transition metals, as iridium (III) chloride, rhodium (III) chloride and palladium (II) chloride, were compared in the oxidation of six aromatic aldehydes (benzaldehyde, p ‐chloro benzaldehyde, p ‐nitro benzaldehyde, m ‐nitro benzaldehyde, p ‐methoxy benzaldehyde and cinnamaldehyde), two hydrocarbons (viz. (anthracene and phenanthrene)) and one aromatic and one cyclic alcohol (cyclohexanol and benzyl alcohol) by 50% H 2 O 2 . The presence of traces (substrate: catalyst ratio equal to 1:62500 to 1:1961) of the chlorides of iridium(III), rhodium(III) and palladium(II) catalyze these oxidations, resulting in good to excellent yields. It was observed that in most of the cases palladium(II) chloride is the most efficient catalyst. Conditions for the highest and most economical yields were obtained. Deviation from the optimum conditions decreases the yields. Oxidation in aromatic aldehydes is selective at the aldehydeic group only and other groups remain unaffected. This new, simple and economical method, which is environmentally safe, also requires less time. Reactive species of catalysts, existing in the reaction mixture are also discussed. Copyright © 2007 John Wiley & Sons, Ltd.