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Structure of β-bergamotene

✍ Scribed by K.S. Kulkarni; S.K. Paknikar; A.S. Vaidya; G.R. Kelkar; R.B. Bates; S.C. Bhattacharyya

Publisher
Elsevier Science
Year
1963
Tongue
French
Weight
287 KB
Volume
4
Category
Article
ISSN
0040-4039

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✦ Synopsis

The recent commlmication by Buchi &&. 1 on the structure of calarene prompts us to record some of the results of our investigation on the constituents of solvent extracted oil of Valerisna Wallichi (Fam. Valerianaceae), a species of Indian origin. From the hydrocarbon fraction, we have been able to isolate two pure2 sesquiterpene hydrocarbons by extensive chromatography over alumina. The first of these, Hydrocarbon A, C1#?*3 in its NMR spectrum' exhibited signals at 4.78(;C = C /H \C-H) *. 1. 506 Structure of P-bergamotene No.8 g.g3, 8.95, 9.01 (three methyl-groups not bonded to any double bond); 9.16 and 9.39 .y (CyClOpropyl prOtOnS).

Though the infrared spectra of this hydrocarbon and its dihydro derivative showed great similarity with that of calarene and calarane respectively, we were not able to prove its identity with calarene, since the ccnotants reported by Sorm e&&5 were considerably different from those recorded on our sample.

while we were engaged on the structural studies of these compounds, Buchi and coworkers 1 proposed structure (1) for calarene. The physical constants and NMR data recorded by these authors Proved the iientity of 'Hydrocarbon 41 with

Calarene. @UT reS9ltS

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