2420-87-3Relevant articles and documents
Method for preparing biphenyldianhydride through microwave-assisted catalytic coupling
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Paragraph 0027; 0029; 0033; 0035, (2021/11/06)
The invention discloses a method for preparing biphenyldianhydride through microwave-assisted catalytic coupling. In a green solvent 2 - methyltetrahydrofuran (2-THF) system, under microwave irradiation, under microwave irradiation, under a temperature 60 - 95 °C condition, the reaction time is over 20-60 minutes to prepare a biphenyl derivative, and after hydrolysis and dehydration, biphenyldianhydride is obtained. The present invention is characterized in that an organometallic complex is formed by using a halogenated monomer having a complexing action, and zinc halide generated by the reaction with the reaction. It is avoided that its deposition on the reducing agent metal surface results in a reduction in its reducing ability. Compared with the traditional method for preparing the same biphenyl dianhydride, the method is high in reaction speed, the reducing agent is close to the quantitative reaction, and the cost is lower.
Preparation and separation method of biphenyldianhydride isomer
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Paragraph 0024; 0027; 0028; 0031, (2021/10/05)
The method mainly comprises the following steps: taking nickel salt as a catalyst, coupling with zinc as a reducing agent, coupling with an aliphatic 3 - chloronaphthalimide and an aryl 4 - chlorosuccinimide mixture as a raw material to generate a biphenyl dianhydride derivative, and separating by using different solubility parameters and obtaining 3 and 4 ’ - respectively. 3,3 ’ - And 4, 4 ’ - biphenyl derivatives are hydrolyzed and dehydrated to obtain three biphenyldianhydride isomers, and the patent application is characterized in that a simple method for separating the three biphenyltetracarboxylic dianhydride intermediate is established.
Method for preparing biphenyl dianhydride by coupling halogenated phthalimide monomer based on metal coordination
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Paragraph 0015; 0027-0029; 0033-0035; 0036-0038, (2021/11/03)
The invention discloses a method for preparing biphenyl dianhydride by coupling halogenated phthalimide monomers based on metal coordination. The method mainly comprises the following steps: by taking halogenated phthalimide with complexing coordination capacity as a raw material, zinc or magnesium as a reducing agent and nickel salt as a catalyst, carrying out coupling reaction in an aprotic solvent system to generate a biphenyl derivative, and hydrolyzing and dehydrating to obtain anhydride. A halogenated monomer with a coordination effect and a by-product zinc halide generated by a reaction form an organic metal complex, and the organic metal complex is dissolved in a reaction system and is prevented from being deposited on the surface of a reducing agent metal to cause reduction of the reducing capacity of the reducing agent metal. Compared with the traditional similar preparation reaction of biphenyl dianhydride, the reducing agent is close to quantitative reaction and is more suitable for industrialization.