- Method for synthesizing 1,3-bis(3-aminophenoxy)benzene
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The invention discloses a method for synthesizing 1,3-bis(3-aminophenoxy)benzene, and belongs to the field of organic compound synthesis. The method comprises the following steps: carrying out water separation on m-dinitrobenzene used as a raw material in a mixed solvent, adding anhydrous potassium carbonate, dropwise adding a resorcinol solution under the protection of nitrogen to obtain an intermediate 1,3-bis(3-nitrophenoxy)benzene, and hydrogenating the intermediate to obtain the target product 1,3-bis(3-aminophenoxy)benzene. The target product 1,3-bis(3 aminophenoxy)benzene obtained in the invention has a purity of 99% or above, a white to an off-white color and a total yield of 80% or above. Compared with existing synthesis methods, the synthesis method in the invention has the advantages of easy availability of raw materials, no catalyst, low cost, high economical property, and easiness in realizing industrialized production.
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Paragraph 0032; 0033
(2019/07/16)
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- METHOD FOR PREPARING A POLY(ETHER SULFONIMIDE OR -AMIDE) COPOLYMER USING CYCLIC OLIGOMERS
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Disclosed is a method for preparing a poly(ethersulfonimide or ethersulfonamide) copolymer using cyclic oligomers, and more particularly, to a method for preparing a poly(ethersulfonimide or ethersulfonamide) copolymer by preparing a cyclic ether sulfone oligomer and a cyclic imide or amide oligomer and subjecting the cyclic ether sulfone oligomer and the cyclic imide or amide oligomer to ring-opening copolymerization in the presence of an alkali metal fluoride catalyst.
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- Functionalized Photoreactive Compounds
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The present invention concerns functionalized photoreactive compounds of formula (I), that are particularly useful in materials for the alignment of liquid crystals. Due to the adjunction of an electron withdrawing group to specific molecular systems bearing an unsaturation directly attached to two unsaturated ring systems, exceptionally high photosensitivities, excellent alignment properties as well as good mechanical robustness could be achieved in materials comprising said functionalized photoreactive compounds of the invention.
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- Process for producing 1,3-bis (3-aminophenoxy) benzene
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1,3-Bis(3-aminophenoxy)benzene effective, for example, as a raw material for highly heat-resistant polyimide is produced industrially at a high yield by a reaction between 1,3-difluorobenzene and an alkali metal salt of 3-aminophenol.
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- Preparation process of isoimide
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A preparation process of isoimide comprising reacting a compound having one or more carboxyl group and one or more amide bond in the same molecule in the presence of a haloiminium salt and basic substance, and a preparation process of isoimide comprising reacting a compound having one or more carboxyl group with a compound having one or more amide bond in the presence of a haloiminium salt and basic substance are disclosed.
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- Synthesis of phthalonitrile resins containing ether and imide linkages
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Imide-containing phthalonitrile monomers are prepared from a phthalonitrile and an aromatic dianhydride. The monomer and a method for preparing the monomer is disclosed. These monomers are synthesized into heat resistant polymers and copolymers with aromatic ring structure incorporating imide and ether linkages. The synthesis of the high temperature thermosetting polymers and copolymers is also disclosed.
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