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The review discusses recent advances in the field of acid-catalyzed intra- and intermolecular transformations of pinane terpenoids and their oxygen-containing derivatives. [ABSTRACT FROM AUTHOR]

Three types of new Euphorbia diterpene pseudo-alkaloids possessing 5/6/7/3 (1), 5/6/6/4 (2–5), and 5/7/7/4 (6–7) fused ring skeletons were obtained through an unexpected BF 3 ·Et 2 O/CH 3 CN-mediated structural conversion and amination of lathyrane diterpene (Euphorbia factor L 1), in which the solution acetonitrile had been introduced into the Euphorbia diterpene as a nitrogen source and tandem amination/oxirane-opening (cyclopropane-opening)/oxa-Michael addition reaction was involved in the conversion. The structures of new Euphorbia diterpene pseudo-alkaloids were elucidated by a combination of spectroscopic data and single crystal X-ray diffraction analysis. The basic skeletons of Euphorbia diterpene pseudo-alkaloids 1 and 2 – 5 could fall into the structural types of euphoractine B and euphoractine A diterpenes, respectively, suggesting the possible biogenetic pathway relationship between lathyrane diterpene with euphoractines A and B types diterpenes. Pseudo-alkaloids 1 – 7 did not show any potential cytotoxicity against several tumor cell lines. Unlabelled Image [ABSTRACT FROM AUTHOR]

This paper presents results obtained from the thermoisomerization of essential oils (trementine and pimenta) in the presence of Lewis solid acids. It also reports, in a comparative way, the manisfestation of topical applications of thermochemically treated essential oils used as insecticides or fungistatics. Even if the efficiency degree of trementine oil thermochemically treated (limonene enriched) is inferior to the synthetic insecticides, its action would be more effective and economic by applying appropiate mixtures. All the products used are natural ones, bio-degradable, non-contaminating, and can be easily handled. [ABSTRACT FROM AUTHOR]