Supported nano Pd/MgO catalyst and method of preparing biphenyl compound from catalyst

Abstract

The invention discloses a supported nano Pd / MgO catalyst which comprises nano magnesium oxide as a carrier and palladium as an active component loaded on the carrier, wherein the content of the palladium is 3-10% of total mass of the catalyst. A preparation method of the catalyst comprises the following steps: step I: preparing a palladium-containing aqueous solution, step II: adding nano magnesium oxide into the palladium-containing aqueous solution prepared in the step I, and performing continuous stirring for 1-5h at room temperature, and step III: adding a reducer into a solution preparedin the step II for reduction treatment, reducing divalent palladium in soluble palladium salt to zero-valent palladium, performing filtration to form a filter cake and performing water washing to formthe supported nano Pd / MgO catalyst. The invention provides a method of preparing a biphenyl compound by applying the nano Pd / MgO catalyst into a Suzuki coupling reaction at the same time. The catalyst has the advantages of low possibility of losing metal Pd in the catalyst, recyclability, high catalytic reaction activity, short reaction time and the like.

Description

technical field [0001] The invention relates to a Pd / MgO catalyst, in particular to a supported nanometer Pd / MgO catalyst and a method for preparing biphenyl compounds using the catalyst. Background technique [0002] Since Miyaura et al. reported in 1979 that under the catalysis of palladium, the coupling reaction of organoboron compounds and halogenated hydrocarbons under mild conditions to prepare asymmetric biaryls, the Suzuki coupling reaction has formed a new era in the selective construction of carbon-carbon bonds. a new field of research. The basic principle of Suzuki coupling reaction is that carbon-carbon bond coupling can transform simple molecules into complex molecules. Taking the reaction of bromobenzene and phenylboronic acid as an example, the reaction formula is as follows: [0003] [0004] Suzuki coupling reaction occupies an extremely important position in chemical synthesis. This key step is involved in the synthesis of many organic chemicals such a...

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Problems solved by technology

For a long time, the catalyst of the Suzuki coupling reaction is mainly homogeneous palladium catalyst, but the homogeneous palladium catalyst has brought a series of problems, such as being sensitive to air and water, not easy to separate from the product, etc.

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