Performance of a tetracarbonylmolybdenum(0) pyrazolylpyridine (pre) catalyst in olefin epoxidation and epoxide alcoholysis

authors	Nogueira, LS; Neves, P; Gomes, AC; Valente, AA; Pillinger, M; Goncalves, IS
nationality	International
journal	JOURNAL OF ORGANOMETALLIC CHEMISTRY
author keywords	Molybdenum; Oxidative decarbonylation; Molybdenum oxide; Epoxidation; Alcoholysis
keywords	MOLYBDENUM(VI) COMPLEXES; OXIDATION; PRECURSORS; EFFICIENT; DERIVATIVES; MONONUCLEAR; LIGANDS; TRIS(3,5-DIMETHYL-1-PYRAZOLYL)METHANE; CYCLOOCTENE; REACTIVITY
abstract	Tetracarbonylmolybdenum(0) complexes of the type cis-[Mo(CO)(4)(L)] are attractive synthetic precursors of high oxidation state oxomolybdenum catalysts since the byproducts (CO/CO2) readily separate from the reaction mixture, facilitating separation/purification procedures (e.g. avoiding contamination/acidification of the medium for halide (X)-containing precursors such as [Mo(eta(3)-C3H5) Cl(CO)(2)(L)]). In this work, the conversion of the tetracarbonyl complex cis-[Mo(CO)(4)(ppp)] (ppp = 2-(1-pentyl-3-pyrazolyl) pyridine) to oxomolybdenum compounds has been studied. The molybdenum compounds prepared were explored for liquid phase oxidation and acid catalysis, specifically the epoxidation of cis-cyclooctene with hydroperoxide oxidants, and the alcoholysis of styrene oxide. The routes for the conversion of the cis-[Mo(CO)(4)(ppp)] precursor to oxomolybdenum compounds, during either the synthesis (ex situ) or catalytic (in situ) processes (involving isolation/characterisation of metal species after the catalytic runs), were studied for the different catalytic systems, which helped establish relationships between the type of metal species formed and the catalytic performance. Catalyst recyclability was investigated using a homogeneous catalytic ionic liquid-standing approach. (C) 2017 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE SA
issn	0022-328X
isbn	1872-8561
year published	2017
volume	846
beginning page	185
ending page	192
digital object identifier (doi)	10.1016/j.jorganchem.2017.06.011
web of science category	Chemistry, Inorganic & Nuclear; Chemistry, Organic
subject category	Chemistry
unique article identifier	WOS:000407858700023