title: A highly efficient dioxo(mu-oxo)molybdenum(VI) dimer catalyst for olefin epoxidation.
abstract: 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.
authors: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors: Cláudia C L
authors: CC
authors: Pereira
authors: Salete S
authors: SS
authors: Balula
authors: Filipe A Almeida
authors: FA
authors: Paz
authors: Anabela A
authors: AA
authors: Valente
authors: Martyn
authors: M
authors: Pillinger
authors: Jacek
authors: J
authors: Klinowski
authors: Isabel S
authors: IS
authors: Gonçalves