Abstract
1. The high-boiling neutral fraction of the resin of the Siberian cedar contains abietinal, a diterpene diol C20H34O2, and the diterpene alcohol cembrol C20H34O2 which has a 14-membered ring and three double bonds; the dehydration of cembrol gives the diterpene hydrocarbon cembrene C20H32; the probable structure of cembrol is 14-isopropyl-3, 7, 11-trimethylcyclotetradeca-1, 3, 6-trien-11-ol. 2. Besides the diterpene alcohols and abietinal, the high-boiling oxygen containing fraction of the cedar resin contains D-δ-cadinol C15H26O and a lactone C17H26O3.
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