ChemInform Abstract: NATURALLY OCCURRING TERPENE DERIVATIVES, 71. THE CONSTITUENTS OF STEVIA SPECIES

Volatile Constituents of Geranium Tuberosum L. from Iran

“…Thus, we performed fractionation of the whole extract by column chromatography on silica gel in order to obtain a purified sample of this compound, which was then subjected to NMR analysis. The 1 H-NMR spectral data were in accordance with those of an ester of fragranol [10], like fragranyl acetate (3) [11], which is easily discriminated from grandisyl acetate [12] on the basis of the chemical shift of the methyl group linked to the cyclobutane moiety. According to the spectral data of fragranol [10], its 13 C NMR signals were also consistent with the structure of fragranyl acetate and are reported herein for confirmation, as well as for their usefulness in the analysis of complex mixtures by 13 C NMR [13][14].…”

“…Up to now, fragranyl acetate has been reported only in three different species. After its discovery by Bohlmann et al [11] in the root extract of Artemisia fragrans Willd., it was subsequently found in two members of the genus Achillea : A. ptarmica [15] and A. wilhelmsii C. Kock (Syn. A. santolina L.) [16,17].…”

Derivados hemisintéticos del ent-kaurenol y evaluación de su actividad antimicrobiana.

“…La obtención de seis nuevos derivados hemisintéticos a partir de ent-kaurenol (I), se realizó mediante la reacción de esterificación de Steglich empleando los ácidos p-cloro-fenilacético, o-cloro-fenil-acético, m-cloro-fenilacético, p-bromo-fenil-acético, nicotínico y salicílico; utilizando la combinación de diciclohexilcarbodiimida (DCC, agente de acoplamiento), 4…”

“…El aislamiento y caracterización como producto natural lo realizaron por primera vez Piozzi y cols. (1971) a partir de Espeletia grandiflora, posteriormente fue obtenido de Anona squamosa L. [3,4].…”