Covalent organic framework material loaded Pd catalyst and preparation method and application thereof

Abstract

The invention discloses a covalent organic framework material loaded Pd catalyst and a preparation method and application thereof. The covalent organic framework material loaded Pd catalyst comprisesa covalent organic framework material and Pd2+ loaded on the covalent organic framework material. The preparation method comprises the following steps: 1) mixing an aldehyde precursor, an amine precursor and absolute ethyl alcohol, carrying out aldehyde-amine condensation reaction, and separating and purifying the product to obtain a covalent organic framework material; and 2) mixing the covalentorganic framework material, soluble Pd salt and dichloromethane, carrying out impregnation loading, and separating and purifying the product. The covalent organic framework material loaded Pd catalystdisclosed by the invention has the advantages of high catalytic activity, good selectivity, the wide substrate application range, easiness in recycling, mild reaction conditions, the green and environment-friendly reaction solvent and the like when being used for Suzuki reaction, and is simple in preparation process, easily available in raw materials, low in production cost and the like.

Description

technical field [0001] The invention relates to a covalent organic framework material supported Pd catalyst, a preparation method and application thereof. Background technique [0002] The coupling reaction of carbon-carbon bonds is a key reaction step in the synthesis of many organic chemicals (such as drugs, fuels and pesticides, etc.), and occupies a very important position in the synthesis of organic chemistry. The Suzuki reaction catalyzed by transition metal Pd is a relatively new organic coupling reaction, which has many advantages such as strong substrate adaptability and functional group tolerance, mild reaction conditions, few by-products and easy handling. Efficient approach to carbon bonding. [0003] Currently, catalysts for the Suzuki reaction are generally divided into two categories: 1) organic ligands (PPh 3 ) 4 Supported Pd homogeneous catalyst: This type of catalyst has the advantages of high activity and good selectivity, but palladium has poor stabili...

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Problems solved by technology

[0003] At present, catalysts for the Suzuki reaction are generally divided into two categories: 1) organic ligands (PPh 3 ) 4 Supported Pd homogeneous catalyst: This type of catalyst has the advantages of high activity and good selectivity, but palladium has poor stability in conventional media (water, air), and the reaction conditions are harsh (air isolation, benzene as a solvent), and the catalyst It is difficult to separate and reuse, and the preparation of organic ligands is complex, unstable and expensive; 2) Pd heterogeneous catalysts supported by porous materials (such as molecular sieves, activated carbon, organic polymers, etc.): this type of catalyst has the advantages of easy separation and recovery, The reaction effect is good, etc., but due to the weak interaction between the metal center and the carrier, the problem of active component falling off and metal center agglomeration is prone to occur, the repeatability of the catalyst is unstable, and the preparation process of the porous material carrier is cumbersome

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