Polymorphism in 2,2′-diphenyl-5,5′-bibenzimidazole
✍ Scribed by J. J. Kane; R. T. Conley
- Book ID
- 112122239
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1970
- Tongue
- English
- Weight
- 254 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0022-152X
No coin nor oath required. For personal study only.
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## Abstract Poly(2,2′‐imidazole‐5,5′‐bibenzimidazole) (PBI‐imi) was synthesized via the polycondensation between 3,3′,4,4′‐tetraaminobiphenyl and 4,5‐imidazole‐dicarboxylic acid. Effects of the reaction conditions on the intrinsic viscosity of the synthesized polymers were studied. The results show
## Abstract The principal direction of conventional photolysis of the regioisomeric 2,2‐dimethyl‐5,5‐diphenyl‐ and 5,5‐dimethyl‐2,2‐diphenyl‐substituted 4‐diazodihydrofuran‐3(2__H__)‐ones **1a** and **1b**, respectively, is the __Wolff__ rearrangement, while other photochemical processes, which are