resumo
The molybdenum(II) tricarbonyl complexes [Mo(CO)(3)I2L (n) ] (n = 1, L = 2,2'-bipyridine, 4,4'-di-tert-butyl-2,2'-bipyridine; n = 2, L = pyridine, 4-tert-butylpyridine) have been examined as catalyst precursors for the epoxidation of the biorenewable olefin methyl oleate with tert-butylhydroperoxide. In situ oxidative decarbonylation of the precursors gives highly active and selective molybdenum(VI) catalysts, which were identified as the one-dimensional molybdenum oxide/bipyridine polymer [MoO3(2,2'-bipyridine)], octanuclear [Mo8O24(4,4'-di-tert-butyl-2,2'-bipyridine)(4)], and the pyridinium beta-octamolybdates (LH)(4)[Mo8O26] for L = pyridine or 4-tert-butylpyridine.
palavras-chave
EPOXIDIZED SOYBEAN OIL; TERT-BUTYL HYDROPEROXIDE; UNSATURATED FATTY-ACIDS; OLEFIN EPOXIDATION; TUNGSTEN COMPLEXES; VEGETABLE-OILS; ETA(5)-CYCLOPENTADIENYL MOLYBDENUM; CYCLOALKYL MOIETIES; BETA-OCTAMOLYBDATE; CRYSTAL-STRUCTURE
categoria
Chemistry
autores
Gamelas, CA; Neves, P; Gomes, AC; Valente, AA; Romao, CC; Goncalves, IS; Pillinger, M
nossos autores
Ana Catarina Costa Gomes Alves
Investigador Auxiliar
Anabela Tavares Aguiar Valente
Investigador Principal
Isabel Maria de Sousa Gonçalves
Professor associado
Martyn Pillinger
Investigador Principal
Patrícia dos Santos Neves
Investigador AuxiliarGrupos
1 - Nanomateriais inorgânicos funcionais e híbridos orgânico-inorgânico
4 - biorrefinarias, materiais de origem biológica e reciclagem
Projectos
Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)
PTNMR - Portuguese Nuclear Magnetic Resonance Network (REDE/1517/RMN/2005)
agradecimentos
We are grateful to the Fundacao para a Ciencia e a Tecnologia (FCT), QREN, FEDER, COMPETE, the European Union and the Associate Laboratory CICECO (Pest-C/CTM/LA0011/2011) for continued support and funding. The FCT is acknowledged for a post-doctoral grant to PN (SFRH/BPD/73540/2010). The NMR spectrometers are part of The National NMR Network (REDE/1517/RMN/2005), supported by POCI 2010 and the FCT.