Shashikumar K. Paknikar
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Two terpenic coumarins, oroselol and jatamansin, have been isolated from the oil obtained from the roots of Nardostachys jatamansi. The compound oroselol is known. The structure of jatamansin which… Continue Reading
Two 4-hydroxy-5-methylcoumarin derivatives have been isolated from the roots of Diospyros kaki Thunb and D. kaki Thunb var. sylvestris Makino. One was shown to be identical to gerberinol, previously… Continue Reading
Abstract The structure ofjatamansic acid has been revised from 2D-NMR data, an INADEQUATE experiment and X-ray diffraction analysis. The stereochemistry was con
Abstract The bromination product of santonic acid in wet chloroform is found to be a dibromide closely related to the tribromosantonin characterized by Woodward, Levine and Yates.
The diol, mp 220 °C, obtained by KMnO4 oxidation of α-santonin is shown by an nOe study to be 4β,5β- rather than 4α,5α-dihydroxy-α-santonin. On further oxidation with Pb(OAc)4, it unexpectedly gives… Continue Reading
Abstract Two new pentacyclic triterpenes of the taraxastane group have beenisolated from Canarium strictum Roxb. One is a ketol and the other a diol. Chemical evidence, IR, UV, NMR spectra and their… Continue Reading
A biogenetic-type synthesis of (+)-cymbodiacetal (1), a novel bismonoterpenoid dihemiacetal, is described.
KMnO 4 oxidation of p-ionone has been reinvestigated. The structure proposed for the hydroxyionolactone 3 obtained in this reaction is supported by MS, UV, IR, 1 H and 13 C NMR data and further… Continue Reading
Two new sesquiterpenes, hydroxyvaleranone and its acetyl derivative, have been isolated from Indian valerian root oil (Valeriana wallichi). On the basis of NMR spectral results along with other… Continue Reading