Characterization of a chiral menthyldimethyltin molybdate and its use as an olefin epoxidation catalyst

resumo

Vibrational spectroscopy and EXAFS studies of an organotin molybdate with the formula [((Me)(2)(menthyl)Sn)(2)MoO4(H2O)(3.5)] reveal that the compound is polymeric and contains [MoO4](2-) tetrahedra coordinated to [R3Sn](+) cationic spacers. The compound can be used as a recyclable solid catalyst for the selective epoxidation of cyclooctene by tert-butylhydroperoxide. In the epoxidation of prochiral olefins such as trans-beta-methylstyrene, the corresponding epoxide isomers are obtained with fairly good to excellent selectivity, albeit with low enantiomeric or diastereomeric excesses.

palavras-chave

OXOMOLYBDATE COORDINATION POLYMERS; MULTINUCLEAR MAGNETIC-RESONANCE; CURVED-WAVE THEORY; X-RAY STRUCTURE; STRUCTURAL CHARACTERIZATIONS; 3-DIMENSIONAL POLYMERS; EXAFS CALCULATIONS; ORGANOTIN; CRYSTAL; SN

categoria

Chemistry

autores

Abrantes, M; Valente, AA; Pillinger, M; Romao, CC; Goncalves, IS

nossos autores

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