Synthesis and catalytic performance for olefin epoxidation of a novel dioxomolybdenum (VI) (ferrocenylmethyleneamino)alcoholate complex
摘要:
A novel dioxomolybdenum (VI) complex of (ferrocenylmethyleneamino) alcoholate was easily synthesized via the reaction of MoO2Cl2(THF)(2) with N-hydroxyethyl ferrocenylimine ligand [(eta(5)-C5H5)Fe{(eta(5)-C5H4)-CH=N-CH2-CH2-OH}], and characterized by FR-IR, H-1 NMR, UV-Vis spectroscopy and elemental analysis. In the presence of the catalytic amount of the dioxomolybdenum (VI) complex, good to excellent selectivities of epoxides (77-95%) were obtained for epoxidation of styrene and cyclohexene with tertbutyl hydroperoxide (TBHP) as oxidant in 1,2-dichloroethane at 12 h. Higher initial activity of the complex was observed for the catalyzed styrene epoxidation (451 mol mol(Mo) (1) h (1)) than that of cyclohexene epoxidation (164 mol molMo (1) h (1)) at 1 h. Meanwhile, influences of reaction temperature, solvents, reaction time as well as catalyst amount for olefin epoxidation were also investigated. (C) 2009 Elsevier B.V. All rights reserved.