Patent number: 4336383
Abstract: 1,1'-Binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid compounds having the following formula: ##STR1## wherein R.sub.1 is hydrogen, halogen, or alkyl; when X is oxygen, Y is hydrogen, alkyl, a cycloalkyl, or an aryl containing at least one substituent from the group including: halogen, alkyl, or alkoxy, when X is nitrogen, Y is ##STR2## wherein R.sub.2 is hydrogen, halogen, or alkyl; Y being linked to X with the formation of a benzimidazole cycle.The method for preparing the compounds according to the present invention resides in the treatment of that 1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid anhydride with an alkali to give a corresponding salt which is condensed with orthophenylenediamines upon heating at reflux at a pH of from 6.3 to 6.8. The resulting benzimidazole-1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid anhydride having the formula: ##STR3## wherein R.sub.
Type:
Grant
Filed:
May 7, 1980
Date of Patent:
June 22, 1982
Inventors:
Georgy N. Vorozhtsov, Natalia N. Masanova, Nikolai B. Feldbljum, Vasily I. Alexeev, Vadim A. Shigalevsky, Georgy G. Solomatin, Olga I. Shulepova, Galina G. Khaitun, Nadezhda V. Gordeeva