The invention relates to a method for producing aniline, comprising the steps of: a) providing o-aminobenzoate, wherein said o-aminobenzoate comprises anthranilate anion and a suitable cation, b) converting said anthranilate anion to aniline by thermal decarboxylation in the presence or absence of a catalyst, c) extracting the aniline produced in step b) in an organic solvent at least once, and d) purifying the aniline produced in steps b) and c) by distillation, wherein said distillation produces aniline and a water phase.

A method of making benzalaniline, the method comprising: providing benzaldehyde and aniline; performing a condensation reaction using a solvent; extracting water from the condensation reaction using a pervaporation system, wherein a poly(vinyl alcohol) PVA membrane is in the pervaporation system; and obtaining benzalaniline.

A method of making benzalaniline, the method comprising: providing benzaldehyde and aniline; performing a condensation reaction using a solvent; extracting water from the condensation reaction using a pervaporation system, wherein a poly(vinyl alcohol) PVA membrane is in the pervaporation system; and obtaining benzalaniline.

Provided are a partially deuterated 1,4-Phenylenediamine-d4 and a preparation method thereof. The partially deuterated 1,4-Phenylenediamine-d4 has a structure as shown in Formula I. The method for preparing the partially deuterated 1,4-Phenylenediamine-d4, including: (1) dissolving p-phenylenediamine in a deuterated solvent to obtain a p-phenylenediamine solution; (2) adding a deuterated reagent and a catalyst in sequence into the p-phenylenediamine solution to obtain a mixture solution, and subjecting the mixture solution to deuteration reaction under a protective atmosphere to obtain a deuterated p-phenylenediamine; and (3) repeating steps (1) and (2) three times sequentially to obtain the partially deuterated 1,4-Phenylenediamine-d4.

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Provided are a partially deuterated 1,4-Phenylenediamine-d4 and a preparation method thereof. The partially deuterated 1,4-Phenylenediamine-d4 has a structure as shown in Formula I. The method for preparing the partially deuterated 1,4-Phenylenediamine-d4, including: (1) dissolving p-phenylenediamine in a deuterated solvent to obtain a p-phenylenediamine solution; (2) adding a deuterated reagent and a catalyst in sequence into the p-phenylenediamine solution to obtain a mixture solution, and subjecting the mixture solution to deuteration reaction under a protective atmosphere to obtain a deuterated p-phenylenediamine; and (3) repeating steps (1) and (2) three times sequentially to obtain the partially deuterated 1,4-Phenylenediamine-d4.

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A method for producing an arylamine compound, wherein a chemical compound represented by formula (B) is reacted by addition reaction with a carbon atom having a bound hydrogen atom on a benzene ring of a chemical compound represented by formula (A), in the presence of one or more acids selected from Lewis acids or sulfonic acids; to produce a chemical compound represented by formula (C) including a partial structure represented by formula (D).

A method for producing an arylamine compound, wherein a chemical compound represented by formula (B) is reacted by addition reaction with a carbon atom having a bound hydrogen atom on a benzene ring of a chemical compound represented by formula (A), in the presence of one or more acids selected from Lewis acids or sulfonic acids; to produce a chemical compound represented by formula (C) including a partial structure represented by formula (D).

A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (C(CF.sub.3)H), as a linkage skeleton, with a tetracarboxylic dianhydride is easily dissolved in an organic solvent and exhibits excellent film forming properties. In addition, the thus-obtained polyimide can be used for an optical film and a display device.

A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (C(CF.sub.3)H), as a linkage skeleton, with a tetracarboxylic dianhydride is easily dissolved in an organic solvent and exhibits excellent film forming properties. In addition, the thus-obtained polyimide can be used for an optical film and a display device.

A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (C(CF.sub.3)H), as a linkage skeleton, with a tetracarboxylic dianhydride is easily dissolved in an organic solvent and exhibits excellent film forming properties. In addition, the thus-obtained polyimide can be used for an optical film and a display device.