- Method for preparing biphenyldianhydride through microwave-assisted catalytic coupling
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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.
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Paragraph 0027-0028; 0033-0034; 0036-0037
(2021/11/06)
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- Synthesis of N-unsubstituted cyclic imides from anhydride with urea in deep eutectic solvent (DES) choline chloride/urea
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N-Unsubstituted cyclic imides were readily synthesized in deep eutectic solvent (DES) choline chloride (ChCl)/urea from anhydrides with urea. Urea serves as both a DES component and a nitrogen source, which endows the protocol with advantages of smooth reaction, easy separation of products, simple recovery and recycling of ChCl/urea.
- Liu, Luxiao,Zhang, Hong-Yu,Yin, Guohui,Zhang, Yuecheng,Zhao, Jiquan
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p. 1351 - 1357
(2019/11/19)
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- Grinding imidation of anhydrides on smectite clays as recyclable and heterogeneous catalysts under solvent-free conditions
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Imidation of various anhydrides employing solvent-free grindstone technique using smectite clays as recyclable and green catalysts was examined and obtained excellent yields.
- Marvi, Omid
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p. 3501 - 3504
(2017/08/14)
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- Phthalimide end capping monomer and its preparation method and application
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The invention relates to a phthalimide-terminated monomer, which has a structural general formula as following: in a H-R4-H formula, R4 is one in the specification, R3 in the specification is one of O, S, SO2, CO, C(CH3)2, C(CF3)2. The invention also provides a preparation method of the phthalimide-terminated monomer and an application of the phthalimide-terminated monomer in preparation of phthalonitrile resin.
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Paragraph 0056; 0057; 0058; 0059; 0060; 0061
(2017/06/02)
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- Rapid and convenient microwave-assisted synthesis of aromatic imides and N-hydroxymethylimides
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Extremely simple high-yielding and rapid microwave-assisted synthesis of wide array of aromatic mono and diimides and mono- and bis-N-hydroxymethylimides is reported.
- Kacprzak, Karol
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p. 1499 - 1507
(2007/10/03)
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