Cross-linked polyvinyl alcohol-supported palladium nanocatalyst and its preparation and application

Abstract

The invention discloses a cross-linked polyvinyl alcohol supported palladium nano catalyst and its preparation and application. The carrier of the cross-linked polyvinyl alcohol supported palladium nano catalyst is cross-linked polyvinyl alcohol, and the active component is palladium. The product yield obtained by the Suzuki coupling reaction catalyzed by the alcohol-supported palladium nanocatalyst is high; at the same time, the cross-linked polyvinyl alcohol-supported palladium nanocatalyst can be recycled and used repeatedly, and since most of the solvent in the Suzuki coupling reaction is water, thus It is beneficial to protect the environment; in addition, palladium exists in the form of nanoparticles in the cross-linked polyvinyl alcohol supported palladium nanocatalyst, so that it can be uniformly dispersed, thereby enhancing the catalytic performance; moreover, the carrier of loaded palladium is cross-linked polyethylene Alcohol, the polymer forming the cross-linked polyvinyl alcohol has strong hydrophilicity, so it is more suitable for reacting in aqueous solution, forms a hydrogel in water, and has a good effect of binding palladium nanometers, thereby extending the cross-linked polyvinyl alcohol Service life of supported palladium nanocatalysts.

Description

technical field [0001] The invention relates to a catalyst and its preparation and application, in particular to a cross-linked polyvinyl alcohol supported palladium nanometer catalyst and its preparation and application. Background technique [0002] In transition metal-catalyzed aryl coupling reactions, the Pd(PPh 3 ) 4 Catalyzed cross-coupling reactions of arylboronic acids with bromine or iodoarenes are known as Suzuki aryl coupling reactions. This reaction has the advantages of mild reaction conditions, tolerance of a variety of active functional groups, little steric hindrance, high yield, and aryl boronic acid is economically available and insensitive to moisture, so it has become a universally applicable C-C bond coupling method. It is widely used in the fields of pharmaceuticals, electronics and advanced materials, and can synthesize complex organic molecules, so it is favored by organic and polymer synthesis workers. The selection of catalysts for Suzuki couplin...

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Problems solved by technology

[0006] In view of the above-mentioned problems, the present invention provides a cross-linked polyvinyl alcohol-supported palladium nano-catalyst and its preparation and application, to overcome the prior art, the palladium salt homogeneous catalyst applied to the Suzuki coupling reaction is not easy to separate and recover, metal The loss of palladium is serious, not only the use cost is high, but also unfavorable to the environment, so as to obtain a higher catalytic activity, a higher product yield obtained by catalyzing the Suzuki coupling reaction, which can be recycled and used many times, and is conducive to environmental protection. Cross-linked polyvinyl alcohol-supported palladium nanocatalyst with long service life

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