| 摘要 |
A process has been invented for the oxygenation of cyclic ethers. General problems in the process are the use of expensive and toxic oxidants, low TONs (turnover numbers), low selectivity and working at elevated temperatures (energy costs). These problems were solved by employing appropriate organometallic catalyst precursors. Using lnd(CO)3Mo-Ru(CO)2Cp, Cp(CO)3Mo-Ru(CO)2Cp and Cp(CO)2Ru-Ru(CO)2Cp or other ruthenium compounds, the aerobic oxidation of tetrahydrofurane (THF) proceeds at room temperature and produces selectively gamma-butyrolactone. Use of the catalysts yields replacement of stoichiometric, toxic co-oxidants by cheap air oxygen, working at room temperature, high selectivity, high TONs and overall formulation of green chemistry which is applicable to cyclic ethers: formula (I) The invented process satisfies the urge for green chemistry by using cheap air oxygen in a catalytic process with unlimited catalyst lifetime and plain water as the side product. Functionalised lactones will be available from corresponding ethers. |
