Method for preparing olefin metathesis catalysts with high thermal stability and application of olefin metathesis catalysts with high thermal stability
A novel, ruthenium-based technology, which is used in the preparation and application of olefin metathesis catalysts with high thermal stability, can solve the problems of low activity and achieve the effects of high catalytic activity, less harmful waste and high stability
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Embodiment 1
[0024] (Preparation of compound A): under argon protection, Ru(=CHAr)Cl 2 LL' and o-(Furan)-N=PPh 3 The molar ratio was set at 1:1.1, and Ru(=CHAr)Cl was dissolved in dichloromethane (25ml) in a 50ml Schlenk bottle 2 LL', then o-(Furan)-N=PPh in the constant pressure dropping funnel 3 Dissolve in 15ml of dichloromethane, add dropwise to Ru(=CHAr)Cl 2 In LL' dichloromethane solution, react at room temperature for 6h, the color becomes dark green, and the solvent is removed by vacuum pump to obtain a dark green viscous substance, which is washed 3 times with petroleum ether to obtain a dark green solid.
Embodiment 2
[0026] (Preparation of compound B): under argon protection, Ru(=CHAr)Cl 2 LL' and o-(Furan)N=PCy 3 The molar ratio was set at 1:1.1, and Ru(=CHAr)Cl was dissolved in dichloromethane (25ml) in a 50ml schlenk bottle 2 LL', then o-(Furan)-N=PCy in the constant pressure dropping funnel 3 Dissolve in 15ml of dichloromethane, add dropwise to Ru(=CHAr)Cl at -78°C 2 In the LL' dichloromethane solution, the temperature was raised to -10°C for 5 hours, and it turned into a dark green solution. The solvent was removed by a vacuum pump to obtain a dark green viscous substance, which was washed 3 times with petroleum ether to obtain a dark green solid.
Embodiment 3
[0028] (Preparation of compound C): under argon protection, Ru(=CHAr)Cl 2 LL' and PhN=P t- Bu 3 The molar ratio was set at 1:1.1, and Ru(=CHAr)Cl was dissolved in dichloromethane (25ml) in a 50ml schlenk bottle 2 LL', then o-(Furan)N=P in the constant pressure dropping funnel t- Bu 3 Dissolve in 15ml of dichloromethane, add dropwise to Ru(=CHAr)Cl at -78°C 2 In the LL' dichloromethane solution, the temperature was raised to -20°C for 4 hours to turn into a yellow-green solution. The solvent was removed by a vacuum pump to obtain a yellow-green viscous substance, which was washed 3 times with petroleum ether to obtain a yellow-green solid.
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