Carbon-13 chemical shifts of eight 3H-1,4-benzodiazepine-2,5( lH, 4H)-diones are reported. The carbonyl chemical shifts have diagnostic value for distinguishing these diones from the isomeric 1,3-benzodiazepine-2,5-dione structures.
1H NMR investigation of ring mobility of 1,5-benzodiazepine-2,4-diones
โ Scribed by Giuseppe Chidichimo; Marcello Longeri; Giuseppina Menniti; Giovanni Romeo; Alida Ferlazzo
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 273 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
The ring mobility of some 1,5-benzodiazepine-2,4-diones and 1,4-benzodiazepin-2-one has been investigated by lhe temperature dependence of their 'H NMR spectra. The activation parameters have been obtained, and the influence of N-1 substitution on the ring mobiity is discussed, takiig into account previously reported data for similar compounds.
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## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract Pentadeuteriophenyl clobazam 5 was synthesized in essentially quantitative isotopic purity, and characterized by ^1^HโNMR and mass spectroscopy. The title compound was found to be โฅ98% pure by HPLC, and its retention time (t~R~ 6.17 min) was less than that of an authentic clobazam stand