cas 10109-95-2, 2,5-DIANILINOTEREPHTHALIC ACID

Articles about 10109-95-2Total 8 be found

Preparation method for quinacridone and derivatives of quinacridone
The invention relates to the field of synthesis of organic pigments and discloses a preparation method for quinacridone and derivatives of the quinacridone. The preparation method comprises the steps that dimethyl succinate generates sodium dimethyl succinylsuccinate (DMSS) through cyclic condensation under an effect of sodium methoxide, and then being acidized into DMSS; condensation reaction occurs between the DMSS and aniline or substituted aniline, an intermediate product generated during condensation is directly oxidized and dehydrogenated by sodium 3-nitrobenzene sulfonate to obtain an oxidative product; and finally coarse products of the quinacridone or the derivatives of the quinacridone are prepared from the oxidative product in a ring-closing mode under an effect of polyphosphoric acid, and finally finished products of the quinacridone or the derivatives of the quinacridone are obtained through pigmentation treatment.
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Paragraph 0028

(2017/08/29)

Method for preparing 2,5-di(substituted) arylamino terephthalic acid
The invention relates to a method for preparing 2,5-di(substituted) arylamino terephthalic acid by oxidizing 2,5-di(substituted) arylamino-3,6-dihydro-terephthalic acid ester. Hydrogen peroxide is adopted as an oxidizing agent in the method; the hydrogen peroxide is capable of completely oxidizing matter to be oxidized (the reactant conversion rate is high), and has better selectivity (the purity and the yield of a target object are both higher); furthermore, the hydrogen peroxide is converted into water after being oxidized, and a reaction system has no byproducts formed by over oxidation. Therefore, the method for preparing the 2,5-di(substituted) arylamino terephthalic acid, provided by the invention, is economic, friendly to environment and easy to control in reaction.
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Paragraph 0032; 0033; 0034

(2016/10/07)

Hydrogen-bonding-induced chirality organization and stabilization of redox species of polyaniline-unit molecules by introduction of amino acid pendant groups
The chirality organization of polyaniline-unit molecules was achieved by the introduction of amino acid pendant groups through intramolecular hydrogen bonding, which plays an important role in the stabilization of the chirality-organized redox species. Another interesting feature of the synthesized polyaniline-unit molecules is the luminescent switching properties based on the redox states of the phenylenediamine moiety. Getting organized: The chirality organization of polyaniline-unit molecules was achieved by the introduction of pendant amino acid groups through intramolecular hydrogen bonding; these groups play an important role in the stabilization of the chirality-organized redox species.
Moriuchi, Toshiyuki,Ohmura, Satoshi D.,Morita, Kenji,Hirao, Toshikazu
experimental part
p. 3206 - 3213
(2012/02/13)

2,5-DI(METHOXYANILINO)TEREPHTHALIC ACID POLYMORPHS AND QUINACRIDONES REALIZED THEREFROM
2,5-di(p-methoxyanilino)terephthalic acid crystal types I and Il are made by controlling the pH during the recovery of the oxidized product of the condensation of dimethylsuccinyl succinate with p-methoxyaniline. The resulting 2,5-di(p- methoxyanilino)-terephthalic acid can be converted into 2,9-dimethoxyquinacridone or a solid solution thereof having controlled characteristics.
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Page/Page column 12-13

(2008/06/13)

PROCESS FOR THE PREPARATION OF ORGANIC PIGMENTS
The present invention relates to advantageous processes for the manufacture of organic pigments and their precursors. The invention particularly relates to reactions carried out in an "All In One Reactor" (Draiswerke GmbH, Germany), a kneader like the TurbuKneader of the same company, a paddle dryer like the Turbudry of the same company or a related system and thereby submitting the reaction mixtures to enhanced driving power as expressed by a Froude number>1, the reaction mixture being caused to react in high concentrations at elevated temperature.
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Page/Page column 15

(2010/02/14)

Quinacridone pigment compositions comprising unsymmetrically substituted components
The present invention relates to a novel quinacridone pigment compositions, a process using a mixed amine synthesis for the ultimate production of the compositions and to their use as colorants for pigmenting high molecular weight organic materials.
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Page 10

(2010/02/10)

Process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters
The present invention relates to a process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters of the formula STR1 in which R is a hydrogen atom or a methyl or an ethyl group, by reaction of a succinic acid dialkyl ester with a sodium alcoholate in xylene, treatment of the resulting 2,5-dihydroxy-cyclohexadiene-1,4-di-carboxylic acid dialkyl ester with acid and aniline, dehydrogenation of the resulting 2,5-di-phenylamino-dihydro-(3,6)-terephthalic acid dialkyl ester by means of oxygen, if appropriate hydrolysis of the 2,5-di-phenylamino-terephthalic acid dialkyl ester formed and liberation of the 2,5-di-phenylamino-terephthalic acid from the di-sodium salt formed. The 2,5-di-phenylamino-dihydro-(3,6)-terephthalic acid dialkyl ester is reacted with pure oxygen in the presence of an alkali metal ion and/or an alkaline earth metal ion. This significantly decreases undesirable impurities.
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(2008/06/13)

Process of the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters in a high purity
An ecologically and economically improved process for the preparation of 2,5-di-phenylamino-terephthalic acid and its di-alkyl esters of the formula (1) STR1 in which R is a hydrogen atom or a methyl group and R' is a hydrogen atom or a methyl or ethyl group.
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(2008/06/13)