Carbon-13 and proton two-dimensional NMR study of diterpenoids of Coleus forskohlii
โ Scribed by Om Prakash; Raja Roy; J. S. Tandon; M. M. Dhar
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 237 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0749-1581
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## Abstract Carbonโ13 signal assignments of the labdane diterpenoids phlogantholideโA, its diacetate and isophlogantholideโA are reported. The assignments of the ^13^C NMR signals of 14โdeoxyandrographolide and its diacetate, made earlier, have now been confirmed by lanthanide shift studies on the
H and 13C NMR chemical shifts of a series of 1 -substituted pyridinium salts were measured in dimethyl sulfoxide. The effect of the quaternary pyridinium ring on the resonance of the methylene group of the substituent is reported. Increments of 6'H = 3.89 f 0.1 6 ppm and 6' 3C = 47.5 f 3.7 ppm are e