ChemicalBook CAS DataBase List Pigment Red 122

Pigment Red 122 synthesis

4synthesis methods

Product Name:Pigment Red 122
CAS Number:980-26-7
Molecular formula:C22H16N2O2
Molecular Weight:340.37

10291-28-8

980-26-7

The general procedure for the synthesis of 2,9-dimethylquinolo[2,3-B]acridine-7,14(5H,12H)-dione from 2,5-bis[(4-methylphenyl)amino]-1,4-benzenedicarboxylic acid is as follows: a thermocouple and a condenser (which constitutes a distillation apparatus) were fitted in a 1 L three-neck flask equipped with an electrically heated magnetic stirrer. 84.5 g of polyphosphoric acid (PPA, 0.25 mol) was added to the flask and preheated at 100 °C for 3 hours. Subsequently, 18.8 g of 2,5-bis[(4-methylphenyl)amino]-1,4-benzenedicarboxylic acid (0.05 mol) was added, and the reaction temperature was raised to 125 °C for 3 h before the reaction was stopped. The final crude product 2,9-dimethylquinolo[2,3-B]acridine-7,14(5H,12H)-dione was obtained 16.93 g in 99.59% yield.

10291-28-8 Synthesis

10291-28-8
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980-26-7
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Yield:980-26-7 99.59%

Reaction Conditions:

with polyphosphoric acid PPA at 125; for 6 h;Dieckmann Condensation;

Steps:

2.3 3, closed-loop reaction:
In a 1 L three-necked flask equipped with an electrically heated magnetic stirrer, a thermocouple and condenser (distillation unit) were installed. , In three84.5 g PPA (0.25 mol) of polyphosphoric acid was added to the flask, and after 3 hours at 100 ° C, 18.8 g of 2,5-dimethylAniline terephthalic acid (0.05mol), add the material, the reaction at 125 3h, stop the reaction. The crude product 2,9-dimethylquinacridone 16.93g, yield 99.59%.

References:

Zhejiang Jiangshan Chemical Co., Ltd.;Xu Xiaohang;Lv Rong;Wang Zongbo;Han Mengmeng;Dou Herui CN106831763, 2017, A Location in patent:Paragraph 0033

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