Artesin — A new sesquiterpene lactone from Artemisia santolina

Chemistry of Natural Compounds - The epigeal part ofArtemisia santolina Schrenk has yielded a new sesquiterpene lactone, artesin, C14H22O3, having the structure...     

Structure of artabin

Summary FromArtemisia absinthium L. a new sesquiterpene lactone of the germacrane type — artabin — has been isolated. Structure I is proposed for it.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Translated from Khimiya Prirodnykh Soedineii, No. 6, pp. 691–694, November–December, 1970.     

Determination of the absolute configuration of the asymmetric center at C11 in the eudesmanolides

It has been shown that it is possible to use the method of circular dichroism to determine the absolute configuration of the asymmetric center at C₁₁ in the eudesmanolides. The orientations of the hydroxy group at C₁ and of the methyl group at C₄ in arabsin have been established.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 343–346, May–June, 1980.     

Circular dichroism of some chlorine-containing guaianolides

A study of the circular dichroism of chlorine-containing guainolides has shown that a negative Cotton effect in the 260-nm region correlates with the trans-linkage of the lactone ring in acroptilin, hyrcanin, chlorohyssopifolin B, elegin, and biebsanin. It has been established that this nature of the linkage does not change on relactonization and hydrogenation. A chloromethylene substituent at C₄ causes a bathochromic shift of the lactone Cotton effect.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 650–652, September–October, 1979.     

Circular dichroism of some chlorine-containing guaianolides

A study of the circular dichroism of chlorine-containing guainolides has shown that a negative Cotton effect in the 260-nm region correlates with the trans-linkage of the lactone ring in acroptilin, hyrcanin, chlorohyssopifolin B, elegin, and biebsanin. It has been established that this nature of the linkage does not change on relactonization and hydrogenation. A chloromethylene substituent at C₄ causes a bathochromic shift of the lactone Cotton effect.     

The structure of artelein — A dimeric lactone of a new type from Artemisia leucodes

The structure of a dimeric lactone of a new type fromArtemesia leucodes, artelein, has been established unambiguously on the basis of an analysis of the results of IR, high-resolution mass, PMR, and¹³C NMR spectroscopy of the substance itself and an x-ray structural investigation of its acetyl derivative.Deceased.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 46–52, January–February, 1986.