ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.
[Show abstract][Hide abstract] ABSTRACT: Sixteen terpene compounds were isolated from the soldier defensive secretions of seven European termite taxa of the genus Reticulitermes (Isoptera, Rhinotermitidae). We describe species-specific mixtures of monoterpenes (alpha-pinene, beta-pinene, limonene), sesquiterpenes (germacrene C, germacrene A, germacrene B, beta-selinene, delta-selinene, gamma-selinene, (E)-beta-farnesene, gamma-cadinene, nerolidol), diterpenes (geranyl linalool, geranyl geraniol, geranyl geranial), and one sesterterpene (geranyl farnesol). Compounds were purified by HPLC and their structures determined by means of MS spectrometry, or 1D and 2D NMR spectroscopy. Comparison of two different analytical approaches, CC-MS and HPLC with subsequent NMR spectroscopy, revealed Cope rearrangement of germacrene A, germacrene B, and germacrene C to the respective beta-elemene, gamma-elemene, and delta-elemene under GC conditions, thus demonstrating the limits for this analytical approach. The species-specific compound composition provides insight into taxonomy and species origin of European Reticulitermes. The biological significance of the species-specific composition of Reticulitermes defensive secretions is briefly discussed.
Full-text · Article · Apr 2003 · Journal of Chemical Ecology
[Show abstract][Hide abstract] ABSTRACT: A review of all naturally occurring plant orthoesters with various bioactivities that were discovered between 1960-2008 is presented. The review revealed the occurrence and distribution of plant orthoesters of daphnane diterpenoids, phragmalin limonoids, bufadienolide, and ergostane steroids. The review also focused on the structure activity relationship (SAR) or the mode-of-action of the biologically active orthoesters. It also discussed the approaches that were adopted to the orthoester subunit and synthetic efforts toward some of the biologically significant plant orthoesters. It was revealed that the presence of these orthoesters was limited to a few species and they were present mainly in the compound classes of daphnane diterpenoids, phragmalin limonoids, bufadienolide, and ergostane steroids.
No preview · Article · Feb 2009 · Chemical Reviews