abstract
The complexes (PPh(4))(2)[Mo(VI)O(2)(NCS)(4)] (1), Mo(VI)O(2)(NCS)(2)(di-tBu-bipy) (2) and Mo (2) (VI) O(5)(NCS)(2)(di-tBu-bipy)(2) (3) (di-tBu-bipy = 4,4'-di-tert-butyl-2,2'-bipyridine) were studied as catalyst precursors for the oxidation of cyclooctene (Cy8) and benzyl alcohol (BzOH), using either dimethyl sulfoxide (DMSO) or tert-butyl hydroperoxide (TBHP) as oxidant. By dissolving complex 2 in the room temperature ionic liquid 1-butyl-3-methylpyridinium tetrafluoroborate, the catalytic performance with TBHP was improved (higher selectivity to the aldehyde and higher Cy8 conversions). For Cy8 oxidation, the unreacted substrate and products were easily extracted with n-hexane, and the ionic phase containing the catalyst could be reused without loss of catalytic performance.
keywords
OXYGEN-ATOM TRANSFER; OLEFIN EPOXIDATION; MOLYBDENUM COMPLEXES; DIOXOMOLYBDENUM(VI) COMPLEXES; CRYSTAL-STRUCTURES; HYDROGEN-PEROXIDE; ORGANIC-COMPOUNDS; OXO; DIOXO; REACTIVITY
subject category
Chemistry
authors
Monteiro, B; Gago, S; Neves, P; Valente, AA; Goncalves, IS; Pereira, CCL; Silva, CM; Pillinger, M
our authors
Anabela Tavares Aguiar Valente
Principal Researcher
Carlos Manuel Silva
Associate Professor
Isabel Maria de Sousa Gonçalves
Associate Professor
Martyn Pillinger
Principal Researcher
Patrícia dos Santos Neves
Assistant Researcheracknowledgements
We are grateful to the Fundacao para a Ciencia e a Tecnologia (FCT), POCI 2010, OE and FEDER for funding (Project POCI/CTM/58507/2004). The FCT is acknowledged for doctoral grants to BM and PN, and post-doctoral grants to SG and CCLP.