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The Synthesis of Palladium Catalysts Supported on MCM-41 Mesoporous Molecular Sieves and Their Application in Preparation of 2-Fluoro-4-Ethyl-4-Pentyl Terphenyl

Author: CaoPei
Tutor: MaQiMin
School: Ocean University of China
Course: Environmental Science
Keywords: Suzuki reaction MCM-41 mesoporous molecular sieves Supported palladium catalyst 2'- fluoro-4 - ethyl-4 - n- pentyl -terphenyl
CLC: TQ242.1
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 0
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Abstract


The Suzuki reaction is one of the most important organic reaction unit in the coupling reaction that generates the CC bond . The Suzuki reaction catalyst Pd (PPh 3 ) 4 , Pd (OAc) 2 etc. catalysts . These catalysts in the Suzuki reaction has made ??remarkable achievements, but at the same time there are also the shortcomings can not be ignored these catalysts : homogeneous catalyst is difficult to be separated from the reaction mixture , the catalyst recovery difficult , and can not be reused , increased reaction costs. The homogeneous palladium catalyst is immobilized to the carrier prepared heterogeneous palladium ligand catalyst, so that it does not affect the activity and selectivity of the reaction to achieve recycling , reduce production costs , reduce environmental pollution, has now become the Suzuki reaction research focus. This article by the MCM-41 mesoporous molecular sieve surface modification , respectively diphenylphosphino methanol acetylpyridine thiophenecarboxaldehyde three kinds of ligand grafting of MCM-41 , and finally through a coordinated way PdCl 2 Pd (OAC) 2 load , respectively, to the surface of the material , the synthesis of the three kinds of MCM-41 supported palladium catalyst . The successful application of this catalyst in the Suzuki reaction for the preparation of liquid crystal intermediate 2'-fluoro -4 \the loss of the palladium catalyst in the process was found MCM - 41 load dual bidentate phosphine palladium (II) complexes (MCM-41-2P-Pd (II)) catalyst prepared in Synthesis 2B ( F ) B5 better catalytic effect, while the system examines the selection of a base in the reaction , the reaction solvent , reaction temperature, reaction time and amount of catalyst and reaction conditions such as the influence on the reaction results after the optimum conditions to yield up to 92.5% , the catalyst can be reused after 4 times still high activity, the conversion rate of the raw material is greater than 85%.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic hydrocarbons and halogen derivatives > Halogen derivatives of benzene and its homologues
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