Abstract
The complexes Mo{η5-C5H4[CH(CH 2)3]-η1-CH}(CO)3 (2a) and W{η5-C5H4[CH(CH2) 3]-η1-CH}CO)3 (2b) were synthesized by reacting spiro-[4.2]bicyclo[4.1]deca-6,8-diene (1) with the tri(acetonitrile) tri(carbonyl)metal complexes M(CO)3(CH3CN)3 (M=Mo, W). Thermogravimetric (TGA) measurements confirm that the complexes are stable up to 140°C in air in the solid state. The complexes 2a and 2b are very active catalysts at room temperature for the epoxidation of cyclooctene with tert-butyl hydroperoxide (TBHP) as oxidant, reaching TOFs of up to 3650 h-1. Complex 2a achieves a quantitative product yield without formation of any by-products within 1.5 h, outperforming previously published ansa compounds and performing on par with the cyclopentadienyltri-(carbonyl) (halo)- or (alkyl)molybdenum compelxes CpMo(CO)3R (R=Hal, Me, Et).
Original language | English |
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Pages (from-to) | 66-70 |
Number of pages | 5 |
Journal | Advanced Synthesis and Catalysis |
Volume | 351 |
Issue number | 1-2 |
DOIs | |
State | Published - Jan 2009 |
Keywords
- ansa compounds
- Catalyst design
- Epoxidation
- Molybdenum
- Tungsten