## Abstract Base catalized intermolecular cyclization of 2‐amino‐3‐chloro‐5,6‐dicyanopyrazines gave 5,10‐disubsti‐tuted‐2,3,7,8‐tetracyano‐5,10‐dihydrodipyrazino[2,3‐__b__:2′,3′‐c]pyrazines 11–20. These compounds have rather small molecular size but have strong intramolecular charge‐transfer chromo
Syntheses and thermal properties of 5,10-disubstituted-2,3,7,8-tetracyano-5,10-dihydrodipyrazino[2,3-b:2′,3′-e]pyrazines and polymeric porphyrazines derived from 2,3-dichloro-5,6-dicyanopyrazine
✍ Scribed by Jae-yun Jaung; Sung Dong Kim
- Book ID
- 105638289
- Publisher
- The Korean Fiber Society
- Year
- 2000
- Tongue
- English
- Weight
- 173 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1229-9197
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Syntheses and Spectral Properties of 2,3,7,8-Tetracyano-5,10dihydrodipyrazino(2,3-b:2',3'-e)pyrazine. -The physical, structural, and electronic properties of the novel title compounds (IV) are studied using UV-visible spectroscopy and molecular orbital calculation methods. -
## Thianthrene -2,3,7,8 -tetracarboxylic dianhydride -5,5,10,10 -tetraoxide (TADATO) , a dianhydride having two sulfonyls between two phenyl rings, was synthesized and polymerized with several diamines by a two-step method. Tough polyimide membranes were obtained with flexible diamines but not wit