Cyclooctene epoxidation with H < inf> 2 O < inf> 2 and single crystal X-ray determined crystal structures of new molybdenum and tungsten catalysts bearing the hydrophilic ligand hydroxymethyldiphenylphosphine oxide

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The dioxo molybdenum and tungsten complexes MoO2Cl2(OPPh2CH2OH)2 and WO2Cl2(OPPh2CH2OH)2 have been synthesized and characterized by FT-IR, 1H and 31P 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. © 2007 Elsevier B.V. All rights reserved.

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Journal of Organometallic Chemistry