oxidation of the allyl alcohols 9a or 9b afforded the pure ketones 3a or 3b MnO2 oxidation of the alcohols 10a or 10b furnished the aldehydes 4a or 4b. – Surprisingly, the italicene epoxides 2a or 2b rearranged with diluted HCl to the italicene ethers (epoxyacorenes) 5a or 5b, which previously were isolated from Lantana and Helichrysum oil. – The odor of 3a, 3b, 4a, 4b and 5a was evaluated.
Abstract A new sesquiterpenoid, 15-copaenol, and the known compounds (−)-trans-calamenene, (+)-δ-cadinene, (−)-caryophyllene-4,5-epoxide, (−)-humulene-1,2-epoxide, (−)-cubenol, (−)-epicubenol and (−)-torreyol has been isolated from the heartwood of Pilgerodendronuvifera. The structures of the new and the known compounds were established by spectroscopic methods.