Method for preparing magnetic double-carbene palladium ligand catalyst and using method thereof

Abstract

The invention discloses a method for preparing a magnetic double-carbene palladium ligand catalyst and a using method thereof, and belongs to the field of Suzuki reaction. The method solves the technical problem that the conventional Suzuki reaction catalyst is easily inactivated. The method comprises the following steps of: 1, preparing alkoxy silicified imidazole; 2, preparing alkoxy silicifieddouble-imidazolyl ligand; 3, preparing Fe3O4 supported double-imidazolyl ligand; and 4, preparing the magnetic double-carbene palladium ligand catalyst. Magnetic separation of the catalyst can be realized by supporting the homogeneous palladium ligand catalyst on the surface of super-paramagnetic Fe3O4. The magnetic double-carbene (NHC) palladium ligand catalyst applied to the Suzuki reaction cancompletely convert bromobenzene with electron donating group or electron attracting group; and after the catalyst is used for 7 times, the catalytic activity does not decline, for the supporting amount of active ingredients does not decline obviously.

Description

Preparation method and application method of magnetic biscarbene palladium ligand catalyst technical field The invention belongs to the field of Suzuki reaction; in particular, it relates to a preparation method and a use method of a magnetic double carbene palladium ligand catalyst. Background technique Homogeneous catalysis has made significant progress in the Suzuki reaction (Suzuki reaction). Typical homogeneous catalytic systems such as carbene (NHC) and biphenylphosphine (Phos) ligand palladium catalytic systems have high activity and achieved difficult Activation of activated chlorinated aromatics. However, because the accumulation and precipitation of metals will lead to the loss of activity of homogeneous catalysts, this is an urgent problem to be solved in large-scale production. The complexation of homogeneous palladium ligand catalysts is an effective way to solve this problem. Contents of the invention The invention solves the technical problem that the e...

AI Technical Summary

Problems solved by technology

The present invention will solve the technical problem that the existing Suzuki reaction catalyst is easily deactivated; and provide a preparation method and a method of use of the magnetic biscarbene palladium ligand catalyst

Images