Development of a scaleable synthesis for 1, 2-bis (2-aminophenylthio) ethane (APO-link) used in the production of bismaleimide resin

CG Densmore, H Wheeler, R Cohenour…

Index: Densmore, Crystal G.; Wheeler, Hilary; Cohenour, Rebecca; Robison, Thomas W.; Hasam, Dawud; Cordova, Blossom J.; Stark, Peter C.; Fuller, Edward N.; Cook, Charles J.; Weber, Holly A. Organic Process Research and Development, 2007 , vol. 11, # 6 p. 996 - 1003

Full Text: HTML

Citation Number: 5

Abstract

The diamine reagent 1, 2-bis (2-aminophenylthio) ethane is no longer commercially available but is still required for the synthesis of the bismaleimide resin, APO-BMI, used in syntactic foams. In this work, we examined the hydrolysis of benzothiazole followed by reaction with dichloroethane or dibromoethane. The deprotonation of 2-aminothiophenol followed by reaction with dibromoethane was also investigated and later optimized for ...