A highly efficient dioxo(mu-oxo)molybdenum(VI) dimer catalyst for olefin epoxidation

resumo

The oxo-bridged dimer [Mo(2)O(4)(mu(2)-O)Cl(2)(pzH)(4)] (1;pzH = pyrazole) exhibits unusually high activity in the liquid-phase catalytic epoxidation of the cyclic olefins cyclooctene and (R)-(+)-limonene under mild conditions and in the absence of additional organic solvents, using tert-butyl hydroperoxide as the oxidant. The complex is stable under the reaction conditions and can be used in further catalytic runs without significant loss of performance. An X-ray crystallographic investigation reveals that 1 has an unprecedented and extremely rare all-cis configuration at each of the MoO(2)(mu(2)-O)Cl(pzH)(2) cores, which can be understood by considering supramolecular contacts and geometric factors.

palavras-chave

DIOXO COMPLEXES; CRYSTAL-STRUCTURES; OXO MOLYBDENUM; LIGANDS; MONONUCLEAR; OXIDATION

categoria

Chemistry

autores

Pereira, CCL; Balula, SS; Paz, FAA; Valente, AA; Pillinger, M; Klinowski, J; Goncalves, IS

nossos autores

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