Synthesis And Catalytic Study Of Novel Ruthenium-Carbene Catalysts

Olefin metathesis is carbon-frame rearrangements which took place between carbon-carbon double bond or carbon-carbon triple bond, was discovered in 1950s. Since the 1990s, olefin metathesis has been widespread concern due to a better functional group compatibility of ruthenium carbene olefin metathesis catalysts was gradually developed. Olefin metathesis has greatly expanded people's imagination of skeleton structure compounds. Use of this reaction, one can synthesize a number of substances that other methods are difficult to. Because of its by-products is the low boiling olefins such as ethylene, it is called"atom economy"green reaction. It has the significance and values on the theoretical research, also have attract widely attention in industry.Through the literature study, we found that the development of new ruthenium carbene catalysts is through changes of ligand and atoms that coordination with the central atom ruthenium, to improve the catalyst efficiency, widespread application, stability, recyclable and other properties. Because of this thought, we use sevaral phenols as raw materials to prepared two types of ligands, then exchange with the 2nd generation Grubbs catalyst to synthesize new catalysts: one is phenyl ether class, the other is pyridine acid-phenol esters. Phenyl ether ligand is to synthesis of Grubbs- Hoveyda-type catalyst, which is the central atom ruthenium coordinated to the atom oxygen. The pyridine-acid-phenol ester ligand is to synthesis of new catalysts with the structure similar to the 3rd generation Grubbs catalyst, that is, the central atom ruthenium coordination with the pyridine ring. After activity test, these two catalysts (a total of 9) all have catalytic olefin metathesis activity.