Catalytic activity of iron-substituted polyoxotungstates in the oxidation of aromatic compounds with hydrogen peroxide
authors Estrada, AC; Simoes, MMQ; Santos, ICMS; Neves, MGPMS; Cavaleiro, JAS; Cavaleiro, AMV
nationality International
journal MONATSHEFTE FUR CHEMIE
author keywords Polyoxometalates; Transition-metal compounds; Oxidations; Arenes; Peroxides; C=C cleavage
keywords KEGGIN-TYPE POLYOXOTUNGSTATES; SELECTIVE OXIDATION; MOLECULAR-SIEVES; POLYOXOMETALATE; TUNGSTOPHOSPHATES; HYDROCARBONS; COMPLEXES; OXYGEN; ALKYLAROMATICS; CHEMISTRY
abstract The tetrabutylammonium (TBA) salts of Keggin-type polyoxotungstates of the general formula [XW(11)Fe(III)(H(2)O)O(39)](n-), where X = P, B or Si, were evaluated as catalysts in the oxidation, under mild conditions, of ethylbenzene, cumene, p-cymene and sec-butylbenzene with aqueous H(2)O(2) in CH(3)CN at 80 degrees C. The influence of various factors, such as the substrate/catalyst molar ratio, the amount of oxidant added or the reaction time, was investigated in a systematic way. Generally, the system exhibited moderate conversion, with good selectivity towards the corresponding acetophenone and hydroperoxide. In order to understand the reaction pathways, the oxidation of several products and presumed intermediates was also carried out in the presence of TBA(4)[PW(11)Fe(H(2)O)O(39)]center dot 2H(2)O. Under the conditions used, the oxidation of styrene and styrene derivatives gave rise mainly to carbon carbon double-bond cleavage, affording the corresponding products in very high yields (81-87%). Possible reaction pathways are presented.
publisher SPRINGER WIEN
issn 0026-9247
year published 2010
volume 141
issue 11
beginning page 1223
ending page 1235
digital object identifier (doi) 10.1007/s00706-010-0370-9
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000283608400007
  ciceco authors
  impact metrics
journal impact factor (jcr 2016): 1.282
5 year journal impact factor (jcr 2016): 1.224
category normalized journal impact factor percentile (jcr 2016): 35.843
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg