Preparation method of magnetic nitrogen-containing bidentate palladium ligand catalyst

Abstract

The method for a preparation method of a magnetic nitrogen-containing bidentate palladium ligand catalyst, and relates to a heterogeneous phase catalyst preparation method. The method solves the problems of poor separation effect and tedious process existed in current heterogeneous phase catalysts. The method comprises the following steps: preparing an imidazoles compound containing siloxane, then preparing a biimidazoles compound containing siloxane, then adding Fe3O4 to prepare a magnetic biimidazoles ligand, finally reacting with a dimethyl acetamide aqueous solution, Pd(OAc)2 and NaOAc to obtain the magnetic nitrogen-containing bidentate palladium ligand catalyst. The invention has the advantages that 1, separation of a reaction system is realized, the operation is easy and convenient; 2, the reaction activity of a plurality of aryl bromides can be increased, the catalytic activity after circular usage for four times possesses obvious reduction. The method is used for preparing the magnetic nitrogen containing bidentate palladium ligand catalyst.

Description

technical field [0001] The invention relates to a preparation method of a heterogeneous catalyst. Background technique [0002] The palladium-catalyzed Suzuki coupling reaction of aryl halides and aryl boronic acids has opened up a new way to construct carbon-carbon bonds, and has a wide range of applications in the synthesis of natural products, medicinal chemistry, and functional materials. The homogeneous palladium catalyst has high activity and selectivity because all the active sites can be connected with the reaction substrate, and it can catalyze the reaction efficiently. However, homogeneous catalysts are difficult to separate from products and solvents, and are difficult to be widely used in industry. However, the existing heterogeneous catalysts mainly use molecular sieves, carbon, and polymers as carriers, and are recycled through filtration and other methods. Although the recycling is realized, the existing heterogeneous catalysts still have the problems of poor...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of poor separation effect and cumbersome process in existing heterogeneous catalysts, and provides a preparation method of a magnetic nitrogen-containing bidentate palladium ligand catalyst

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