PRODUCTION OF SULFOANILINIUM ISOPHTHATIC ACID DIESTER

Japanese Patent JP3959445

B2

PROBLEM TO BE SOLVED: To provide a method for readily producing the subject high-purity compound in high degree of conversion without requiring a complicated process by subjecting sulfoisophthatic acid to esterification reaction with an alcohol compound by azeotropic dehydration and neutralizing the reaction product with anilines.
SOLUTION: (A) 5-Sulfoisophthalic acid of formula I is subjected to esterification reaction with (B) an alcohol compound of formula II [R is a group of the formula R1OCH2CH2COCH2CH2 (R1 is H, a 1-15C alkyl, alkenyl or the like)] by azeotropic dehydration, preferably at 70-100°C in the presence of a water-nonmiscible organic solvent to afford (C) 5-sulfoisophthatic acid diester of formula III which is then neutralized with anilines of formula IV [R2 is a 1-4C alkyl or alkoxyl; (n) is an integer of 0-2] to provide (E) the objective 5-sulfoanilinium isophthalic acid diester of formula V. Furthermore, the component B is charged in an amount of 1.9-3.0 mol based on 1 mol component A. The product E readily forms doped polyaniline by only oxidative polymerization.

Eiji Ogata
Norio Yanase
Shigeru Sakamoto

JP32486297A

August 15, 2007

November 26, 1997

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Konishi Chemical Industry Co., Ltd.

C07C303/32; C07C309/58; C07C319/20; C07C323/12; (IPC1-7): C07C309/58; C07C303/32; C07C319/20; C07C323/12

JP8041321A
JP8041322A
JP5051350A
JP2169544A
JP1199936A
JP63122649A
JP61050941A
JP1115920A
JP5132537A

Eiji Saegusa
Kakehi Yuro
Takeshi Ohara
Hiroji Nakagawa
Yasumitsu Tate
Kenji Saito
Jun Fujii
Hitoshi Seki
Mutsuko Nakano
Shinsuke Otsuki
Suzuki Katsuto

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