Study On The Stability And Catalytic Activity Of Paraffin Wax Encapsulated Kn(?)lker Iron

Catalytic hydrogenation reactions have important applications in industrial production and laboratory synthesis of important organic compounds,among which the catalytic hydrogenation of metal catalysts has attracted much attention.The earliest synthesized noble metal catalysts have been widely used in energy,chemistry and other fields due to their high catalytic activity and atomic economy.However,due to the high cost and toxicity of this type of catalyst,researchers have turned their attention to the synthesis and application of green,inexpensive metal catalysts.In recent years,there have been numerous reports of highly active metal iron catalysts.Among them,the iron complexes of cyclopentadienone show a high activity in the catalytic hydrogenation reaction and have received extensive attention.However,its high sensitivity to air and light causes difficulties in its synthesis and use.To solve this problem,this paper proposes a strategy to encapsulate Knolker iron complexes with paraffin microcapsules to solve this problem.This paper mainly describes the following two aspects:1.To summarize the research progress of cyclopentadienone iron complexes,and to summarize the research and application of this kind of iron complexes in the catalytic hydrogenation and transfer hydrogenation of C=O and C=N bonds.2.The strategy of encapsulating Knolker iron catalyst with paraffin microcapsules was applied and applied to the catalytic hydrogenation of ketones and asymmetric catalytic hydrogenation of quinoxalines.At the same time,the stability of Knolker iron catalyst under this strategy was investigated.Experimental data and NMR spectra show that this strategy not only solves the problem of difficult storage,but also enables the Knolker iron catalyst to be used directly on the desktop for experimental operations.