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Cyclooctene epoxidation with H2O2 and single crystal X-ray determined crystal structures of new molybdenum and tungsten catalysts bearing the hydrophilic ligand hydroxymethyldiphenylphosphine oxide

Authors:
Feng, L.
Urnezius, E.
Luck, R. L
Published by: Journal of Organometallic Chemistry
Date: 4 2008
Volume, Number, Pages: 693 8-9 1564-1571

Accession Number: ISI:000255891400023

Abstract:

The dioxo molybdenum and tungsten complexes MoO2Cl2(OPPh2CH2OH)(2) and WO2Cl2(OPPh2CH2OH)(2) have been synthesized and characterized by FT-IR, H-1 and P-31 NMR. Their structures, as determined by single crystal X-ray diffraction analysis, reveal distorted octahedral geometries with cis terminal oxygen atoms, trans Cl ligands and that the hydroxymethyldiphenylphosphine oxide ligands coordinate through the oxygen atom bonded to the P atom. Both of the compounds are studied as catalysts for the epoxidation of cis-cyclooctene in the presence of hydrogen peroxide as a source of oxygen. Both complexes showed good activity and very high selectivity for the formation of cyclooctene oxide. (C) 2007 Elsevier B.V. All rights reserved.