Epoxidation with hydrotalcite-intercalated organotungstic complexes

W(VI)-based catalysts for epoxidation were incorporated into hydrotalcite either by anionic exchange or by complexation with phosphonic acids previously incorporated between the sheets. Phenyl- and dodecylphosphonic acids and peroxotungstic salts were intercalated into hydrotalcite as attested by th...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2006, Vol.300 (2), p.100-108
Main Authors: Palomeque, Jorge, Figueras, François, Gelbard, Georges
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Chemistry
Dodecylphosphonic acid
Epoxidation
Exact sciences and technology
General and physical chemistry
Hydrogen peroxide
Hydrotalcite
Olefin epoxidation
Peroxotungstate
Peroxotungstic acid
Phenylphosphonic acid
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:W(VI)-based catalysts for epoxidation were incorporated into hydrotalcite either by anionic exchange or by complexation with phosphonic acids previously incorporated between the sheets. Phenyl- and dodecylphosphonic acids and peroxotungstic salts were intercalated into hydrotalcite as attested by the expansion of the lamellar lattice and the complexation of phosphonic acids with W-peroxo species was made possible when using a lipophilic quaternary ammonium peroxotungstic salt [W(VI)-Aliquat] which maintains the layered structure. These catalysts were checked in the epoxidation of cyclohexene with hydrogen peroxide or terbutylhydroperoxide as external oxidants. The materials prepared by anionic exchange gave only epoxycyclohexane but with moderate yields, whereas those prepared from previously incorporated phosphonic acids gave rather high selectivity (50–72%) in allylic oxidation products.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2005.10.037