Formation of an Unusual Guaiane Ketopentaenolide from Dehydroisoleucomisin by the Action of Anhydrous DMF and HCl

Dehydroisoleucomisin (anhydroaustricin) was converted in good yield to guai-1(10),3,5,7(11), 8-pentaen-2-on-12,8-olide by the action of anhydrous HCl in dry DMF. The chemical structure of the product was established using spectral data. The probable formation scheme of this lactone was proposed to include a series of prototopic transformations and ionic dehydrogenation of intermediates. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 339–340, July–August, 2005.     

Thermochemistry of some cytisine derivatives

The enthalpies of solution of cytisine derivatives (phosphoric acid cytiside dimethyl ester, cytisinovinyloxyethylaminothiourea) in 96% ethanol at various dilutions were determined by isothermal calorimetry. Equations describing the dependences ΔH _s ⁰ = f(m ^1/2) (m is the molal concentration) were obtained. The standard enthalpies of solution, combustion, melting, and formation (at 298.15 K) of the compounds were calculated.     

Thermodynamic properties of alkaloids lappaconitine and glaucine

Calorimetric methods were used to study the enthalpy of solution of the alkaloids glaucine C₂₁H₂₅NO₄ and lappaconitine C₃₂H₄₄N₂O₈ in 96% ethanol and their heat capacity in the temperature ranges 173–298.15 and 173–423 K. Equations describing the dependences ΔH _sol ^m ～ f( $\sqrt m $ ) (m is molal concentration) and C _p ⁰ ～ f( $\sqrt T $ ) for the compounds under study were derived. The enthalpies of combustion, melting, and formation of C₂₁H₂₅NO₄ and C₃₂H₄₄N₂O₈ were estimated by means of theoretical calculations.     

About composition of essential oil fromArtemisia filatovae

The essential oil of an endemic (Kazakhstan) species ofArtemisia filatovae, A. kurpijanov sp. nov. (Filatov wormwood), is analyzed by gas chromatography on a capillary column with preliminary separation into fractions using adsorption chromatography on aluminum oxide. The components ofA. filatovae essential oil differ from those ofA. glabella Kar. et Kir. andA. obtusiloba Ldb. Institute of Phytochemistry, Ministry of Science and Higher Education, Republic of Kazakhstan, Karaganda, fax (3212) 43 37 73. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 604–606, September–October, 1999.     

Composition of the essential oils ofArtemisia radicans andA. frigida

The results are given of the GLC analysis on a capillary column of the essential oils of two species of wormwood close in morphological characteristics growing in Kazakhstan:Artemisia radicans A. Kuprijanov andA. frigida Willd., fam. Asteraceae.Institute of Phytochemistry, Ministry of Science and Higher Education, Republic of Kazakhstan, Karaganda, fax (3212) 43 37 73. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp.478–480, July–August, 1999.