Crystal structure of ester Pd-NHC molecular complex and synthetic method

Abstract

The invention belongs to the technical field of catalysts, and discloses an ester Pd-NHC molecular complex and a synthetic method. The synthetic method comprises the steps that in a nitrogen atmosphere or air, a carboxylic ester ligand, divalent palladium ion metal salt, chloride, pyridine and a pyridine derivative solvent are placed in a conventional closed container and are heated for 10-2000 minutes; cooling is carried out to reach the room temperature, and vacuum evaporation is carried out on the solvent so as to obtain solid residues; the obtained solid residues are dissolved in a mixed solvent of dichloromethane and water, and separation is carried out through a separating funnel so as to obtain an organic phase; the organic phase is washed by using a 5% copper sulfate solution and saturated salt water and is dried by using anhydrous sodium sulfate, and vacuum evaporation is carried out on a solvent so as to obtain solid residues; and the obtained solid residues are recrystallized in a mixed solvent of chloroform and normal hexane so as to obtain Pd-NHC molecular crystals. According to the ester Pd-NHC molecular complex and the synthetic method, the carboxylic ester functional group modified Pd-NHC molecular complex is synthesized and a crystal structure of the Pd-NHC molecular complex is obtained.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a crystal structure and a synthesis method of an ester Pd-NHC molecular complex. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Pd-NHC molecular complexes are an important class of organometallic catalysts, which not only have excellent catalytic performance, but also can exist stably in humid air. Typical representatives of such Pd-NHC molecular complexes are PEPPSI type catalysts (C. Valent et al, Angew. Chem. Int. Ed. 2012, 51, 3314–3332). In the molecular structure of PEPPSI-type catalysts, the organoalkane functional group can significantly regulate its catalytic activity through the steric hindrance effect. However, this type of catalyst is a homogeneous catalyst. The catalytic reaction requires the use of volatile and highly toxic organic solvents. It is difficult to separate the ca...

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Problems solved by technology

[0006] (1) In the prior art, the Pd-NHC molecular complexes modified by organic functional groups do not have better catalytic activity, and the Pd-NHC molecular complexes in the prior art do not have the electronic structure to regulate the NHC molecular ligands

[0007] (2) In the prior art, it is not possible to use cheap chlorides to provide a low-cost, high-efficiency catalytic performance ester Pd-NHC molecular complex

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