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http://hdl.handle.net/10773/19781
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DC Field | Value | Language |
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dc.contributor.author | Oliveira, Tania S. M. | pt |
dc.contributor.author | Gomes, Ana C. | pt |
dc.contributor.author | Lopes, Andre D. | pt |
dc.contributor.author | Lourenco, Joao P. | pt |
dc.contributor.author | Almeida Paz, Filipe A. | pt |
dc.contributor.author | Pillinger, Martyn | pt |
dc.contributor.author | Goncalves, Isabel S. | pt |
dc.date.accessioned | 2017-12-07T19:24:37Z | - |
dc.date.issued | 2015 | pt |
dc.identifier.issn | 1477-9226 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19781 | - |
dc.description.abstract | Treatment of the solvent adduct [MoO2Cl2(THF)(2)] with either 2 equivalents of N,N-dimethylbenzamide (DMB) or 1 equivalent of N,N'-diethyloxamide (DEO) gave the dioxomolybdenum(VI) complexes [MoO2Cl2(DMB)(2)] (1) and [MoO2Cl2(DEO)] (2). The molecular structures of 1 and 2 were determined by single-crystal X-ray diffraction. Both complexes present a distorted octahedral geometry and adopt the cis-oxo, trans-Cl, cis-L configuration typical of complexes of the type [MoO2X2(L)n], with either the monodentate DMB or bidentate DEO oxygen-donor ligands occupying the equatorial positions trans to the oxo groups. The complexes were applied as homogeneous catalysts for the epoxidation of olefins, namely cis- cyclooctene (Cy), 1-octene, trans-2-octene, a-pinene and (R)-(+)-limonene, using tert-butylhydroperoxide (TBHP) as oxidant. In the epoxidation of Cy at 55 degrees C, the desired epoxide was the only product and turnover frequencies in the range of ca. 3150-3200 mol mol(Mo)(-1) h(-1) could be reached. The catalytic production of cyclooctene oxide was investigated in detail, varying either the reaction temperature or the cosolvent. Complexes 1 and 2 were also applied in liquid-liquid biphasic catalytic epoxidation reactions by using an ionic liquid of the type [C(4)mim][X] (C(4)mim = 1-n-butyl-3-methylimidazolium; X = NTf2, BF4 or PF6] as a solvent to immobilise the metal catalysts. Recycling for multiple catalytic runs was achieved without loss of activity. | pt |
dc.language.iso | eng | pt |
dc.publisher | ROYAL SOC CHEMISTRY | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/127348/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/121677/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147332/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | PHOSPHINE OXIDE LIGANDS | pt |
dc.subject | BIDENTATE LEWIS-BASE | pt |
dc.subject | CRYSTAL-STRUCTURES | pt |
dc.subject | MOLECULAR-STRUCTURE | pt |
dc.subject | ADDITION-COMPOUNDS | pt |
dc.subject | MOLYBDENUM(VI) COMPLEXES | pt |
dc.subject | DIOXOMOLYBDENUM(VI)-BIPYRIDINE COMPLEXES | pt |
dc.subject | SPECTROSCOPIC CHARACTERIZATION | pt |
dc.subject | ORGANOMOLYBDENUM(VI) | pt |
dc.subject | REACTIVITY | pt |
dc.title | Dichlorodioxomolybdenum(VI) complexes bearing oxygen-donor ligands as olefin epoxidation catalysts | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 14139 | pt |
degois.publication.issue | 31 | pt |
degois.publication.lastPage | 14148 | pt |
degois.publication.title | DALTON TRANSACTIONS | pt |
degois.publication.volume | 44 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1039/c5dt02165k | pt |
dc.identifier.doi | 10.1039/c5dt02165k | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Dichlorodioxomolybdenum(VI) complexes bearing oxygen-donor ligands as olefin epoxidation catalysts_10.1039c5dt02165k.pdf | 716.48 kB | Adobe PDF |
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