13 C NMR Studies on Carboranes and Derivatives: Experimental/Calculational Correlations
β Scribed by Diaz, Martin; Jaballas, Jojo; Arias, Joachin; Lee, Hans; Onak, Thomas
- Book ID
- 127356275
- Publisher
- American Chemical Society
- Year
- 1996
- Tongue
- English
- Weight
- 201 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0002-7863
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## Abstract A series of isoalloxazine and alloxazine derivatives have been investigated by ^13^CβNMR. The synthesis of selectively ^13^Cβenriched derivatives made it possible to assign unambiguously the signals due to the quaternary carbon atoms at position 4, 4a and 10a of the isoalloxazine ring s
## Abstract Assignment of all ^13^C chemical shifts of perezone (1) and some derivatives was possible using time averaged 25Β·15 MHz spectra with the aid of proton noise modulated and CW decoupling. Rapid interconversion of tautomeric forms of 2,5βdihydroxyβ1,4βbenzoquinones is deduced from the ^13^