## Abstract The ^13^C chemical shifts and one‐bond carbon‐hydrogen coupling constants have been obtained for some hydroxycoumarins and their corresponding acetoxy and methoxy derivatives. The changes in the one‐bond carbon‐hydrogen coupling constants resulting from the conversion of a hydroxy group
A13C and15N NMR study of some furoxans and related compounds
✍ Scribed by B. Kamienski; W. Schilf; J. Sitkowski; L. Stefaniak; G. A. Webb
- Publisher
- Springer
- Year
- 1989
- Tongue
- English
- Weight
- 217 KB
- Volume
- 19
- Category
- Article
- ISSN
- 1572-8854
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Pyridofuroxan ([1,2,5]oxodiazolo [3,4-b]pyridine 1-oxide) undergoes isomerization between the N1oxide and N3-oxide forms which can be observed by the 1 H, 13 C and 15 N NMR spectroscopy but not by 14 N and 17 O NMR at ambient and low temperatures. The rearrangement becomes slower at low temperatures
## Abstract ^1^H, ^13^C and ^17^O NMR chemical shifts and ^__n__^__J__(H,H), ^1^__J__(C,H) and ^3^__J__(C‐6, H‐formyl) spin—spin coupling constants of chlorinated vanillins (3‐methoxy‐4‐hydroxybenzaldehydes) were determined. The variation in the long‐range ^4^__J__(H,H) value between the formyl pro
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