Alprazolam underwent a facile 1,4-benzodiazepine ring-opening reaction in an acidic aqueous solution to form a benzophenone compound. The reaction was demonstrated by means of UV, IR, and 1H- and 13C-NMR spectroscopy. Its reverse cyclization reaction to alprazolam occurred when an acidic solution wa
The kinetics of B-a and P-a type copolybenzoxazine via the ring opening process
โ Scribed by Yi-Che Su; Ding-Ru Yei; Feng-Chih Chang
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 119 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0021-8995
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## Abstract An Extended __Hรผckel__ MO treatment of the system __cis__โstilbene (I)โ4a, 4bโdihydrophenanthrene (II) indicates that the concerted photocyclisation is a conrotatory process of the first excited electronic state. The activation energies for the photocyclisation and for the thermal ring