Organic reactions catalyzed by solid superacids. 10. Perfluorinated sulfonic acid resin (Nafion-H) catalyzed ring closure reaction of 2, 2'-diaminobiphenyls. A …

T Yamato, C Hideshima, K Suehiro…

Index: Yamato, Takehiko; Hideshima, Chieko; Suehiro, Kazuaki; Tashiro, Masashi; Prakash, G. K. Surya; Olah, George A. Journal of Organic Chemistry, 1991 , vol. 56, # 21 p. 6248 - 6250

Full Text: HTML

Citation Number: 60

Abstract

The acid-catalyd ring closure of 2, 2'-diaminobiphenyls to corresponding carbazoles has been studied using various acids. 2-'However, these methods require elevated temperatures (> 200" C), long reaction times, and excess of protic acids. Furthermore, some of these reactions were plagued with undesirable side products during cyclization.'Therefore, the scope and selectivity for the preparation of carbazole derivatives have been limited. ...