Monomeric organomolybdenum carbonyl complexes of general formula [(η5-C5R5)Mo(CO)3X] (R = H, CH3, CH2Ph; X = alkyl, halide) are known to be pre-catalysts for olefin epoxidation. In this work, the application of a fluorinated complex, [CpMo(CO)3CF3] (Cp = η5-C5H5), is reported. With hexafluoroisopropanol as a solvent, a turnover frequency (TOF) of >6300 h−1 was achieved in the epoxidation of cyclooctene with tert-butyl hydroperoxide (TBHP) as oxidant. So far, only ansa compounds of formula [Mo(η5-C5H4(CH(CH2)n)-η1-CH)(CO)3] are known to deliver better performances in catalytic epoxidation reactions at room temperature. [CpMo(CO)3CF3] was also applied in 2-phase catalytic epoxidation reactions. The high stability of the oxidised species allows catalyst recycling for multiple catalytic runs without significant loss of activity. Besides, the fluorinated complex enables – at this stage preliminary – mechanistic 19F NMR studies, indicating the nature of the catalytically active Mo-species, which has been an unresolved subject for some time.     «

Monomeric organomolybdenum carbonyl complexes of general formula [(η5-C5R5)Mo(CO)3X] (R = H, CH3, CH2Ph; X = alkyl, halide) are known to be pre-catalysts for olefin epoxidation. In this work, the application of a fluorinated complex, [CpMo(CO)3CF3] (Cp = η5-C5H5), is reported. With hexafluoroisopropanol as a solvent, a turnover frequency (TOF) of >6300 h−1 was achieved in the epoxidation of cyclooctene with tert-butyl hydroperoxide (TBHP) as oxidant. So far, only ansa compounds of formula [Mo(η...     »

ISI Document Delivery No.: 015JY Times Cited: 2 Cited Reference Count: 66 Hauser, Simone A. Cokoja, Mirza Drees, Markus Kuehn, Fritz E. Cokoja, Mirza/B-6906-2009; Kuhn, Fritz/A-3113-2010; Drees, Markus/A-3086-2010 Bavarian elite network NanoCat; TUM graduate school S. A. H. thanks the Bavarian elite network NanoCat for a Ph.D. grant and the TUM graduate school for financial support. M.Sc. Chem. Iulius Markovits is acknowledged for supplying the ionic liquid and Aleksandra Stanojlovic is acknowledged for support with the kinetic studies. 2 Elsevier science bv Amsterdam     «

ISI Document Delivery No.: 015JY Times Cited: 2 Cited Reference Count: 66 Hauser, Simone A. Cokoja, Mirza Drees, Markus Kuehn, Fritz E. Cokoja, Mirza/B-6906-2009; Kuhn, Fritz/A-3113-2010; Drees, Markus/A-3086-2010 Bavarian elite network NanoCat; TUM graduate school S. A. H. thanks the Bavarian elite network NanoCat for a Ph.D. grant and the TUM graduate school for financial support. M.Sc. Chem. Iulius Markovits is acknowledged for supplying the ionic liquid and Aleksandra Stanojlovic is ackno...     »