resumo
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.
palavras-chave
OXYGEN-ATOM TRANSFER; OLEFIN EPOXIDATION; MOLYBDENUM COMPLEXES; DIOXOMOLYBDENUM(VI) COMPLEXES; CRYSTAL-STRUCTURES; HYDROGEN-PEROXIDE; ORGANIC-COMPOUNDS; OXO; DIOXO; REACTIVITY
categoria
Chemistry
autores
Monteiro, B; Gago, S; Neves, P; Valente, AA; Goncalves, IS; Pereira, CCL; Silva, CM; Pillinger, M
nossos autores
Anabela Tavares Aguiar Valente
Investigador Principal
Carlos Manuel Silva
Professor associado
Isabel Maria de Sousa Gonçalves
Professor associado
Martyn Pillinger
Investigador Principal
Patrícia dos Santos Neves
Investigador Auxiliaragradecimentos
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.