Structure of the sesquiterpene lactone artapshinin

On the basis of spectral characteristics (IR,¹H and¹³C NMR spectroscopies) and chemical transformations it has been shown that the new sesquiterpene lactone artapshinin has the structure of 1,3-dihydroxy-6H,7H,11H-germacra-4(5),10(15)-dien-6,12-olide.Institute of Botany, Academy of Sciences of the Azerbaidzhan Republic, Baku. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 837–840, November–December, 1997.     

Structure of the sesquiterpene lactone tanacin

Summary From the leaves ofAtraphaxis pyrifolia Bge. we have isolated a new flavonoid glycoside. By chemical and spectroscopic investigations its structure has been established as 3,4,5,8-tetrahydroxy-7-methoxy-flavonol 3-O--L-rhamnopyranoside.S. M. Kirov Kazakh State University. Translated from Khimiya Prirodnykh Soedenenii, No. 2, pp. 136–140, March–April, 1975.     

Structure of the sesquiterpene lactone stizolicin

Conclusions 1. A new sesquiterpene lactone, stizolicin, has been isolated fromStizolophus coronopifolius (Lam.) Cass.2. Structure II has been proposed as the most probable for stizolicin on the basis of chemical reactions and spectral characteristics.All-Union Scientific-Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 505–508, September–October, 1970.     

Structure of the sesquiterpene lactone stizolicin

Chemistry of Natural Compounds - 1. A new sesquiterpene lactone, “stizolicin,” has been isolated fromStizolophus coronopifolius (Lam.) Cass. 2. Structure II has been proposed as the...     

Structure of the sesquiterpene lactone tanacin

Summary 1. A new sesquiterpene lactone which has been called tanacin has been isolated from the leaves ofTanacetum pseudoachillea C. Winkl.2. On the basis of an interpretation of the PMR spectrum of (I) using the method of multifrequency resonance, the structure of 6-angeloyloxy-1,10-epoxygermacr-4,11(13)-dien-8,12-olide has been established for tanacin.3. The chemical conversion of tanacin into chrysanin has been performed, which confirms the structure found.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 170–174, March–April, 1976.     

Structure of the sesquiterpene lactone elegin

Summary From the epigeal part ofSaussurea elegans Ledeb. have been isolated the lactones chlorohyssopifolin B and elegin, C₁₉H₂₃O₆Cl. On the basis of spectral characteristics and chemical transformations it has been established that elegin has the structure of 15-chloro-3,4-dihydroxy-8-methacryloyloxyguaia-10(14),11(13)-dien-6,12-olide.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 442–445, July–August, 1978.     

Structure of ferulidin: A new sesquiterpene lactone

Conclusions 1. From the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone C₁₅H₁₈O₄ with mp 170–172° C has been isolated; it has been called ferulidin.2. We have shown that ferulidin has the structure I.Khimiya Prirodnykh Soedinenii, Vol. 6, No. 4, pp. 428–431, 1970     

Structure of ferulidin: A new sesquiterpene lactone

Chemistry of Natural Compounds - 1. From the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone C15H18O4 with mp 170–172° C has been isolated; it has been called...     

Stereoselective synthesis and structural correction of the naturally occurring lactone stagonolide G

A convergent synthesis of the structure proposed for the naturally occurring lactone stagonolide G is described. All three stereocenters were created with the aid of asymmetric Brown allylations. The lactone ring was built by means of a ring-closing metathesis (RCM). The synthetic and the natural compound differed in their spectral properties. A new structure is now proposed for stagonolide G and demonstrated by means of a chemical transformation.     

Thermochemistry of sesquiterpene lactone argolide

The enthalpies of dissolution of argolide (C₁₅H₂₀O₃) in 96% ethanol are determined by isothermal calorimetry at 298.15 K and different dilutions of 1: 18 000, 1: 36 000, and 1: 72 000 (by mole). The standard enthalpy of dissolution of argolide in 96% ethanol is calculated from the obtained data: (86 ± 17) kJ mol^?1. The temperature dependence of heat capacity of C₁₅H₂₀O₃ is studied by means of dynamic calorimetry. An equation is derived to describe the С _p ⁰ ~ f (Т) dependence, and the standard heat capacity at 298.15 K is found to be (393 ± 13) J mol^?1 K^?1. The enthalpies of combustion, fusion and formation of argolide are calculated via approximation.     

A sesquiterpene lactone fromAcroptilon repens

A new sesquiterpene lactone has been isolated from the epigeal part ofAcroptilon repens, with the composition C₁₉H₂₂O₆, mp 199–201°C, M⁺ 346, and it has been called acroptin (I). The treatment of (I) with acetic anhydride in pyridine gave a diacetate (II). The structure of (I) has been confirmed by the NMR spectra of (I) and (II). Details of the IR and NMR spectra of (I) and (II) are presented.