Structure of Helenium Lactone
نویسندگان
چکیده
منابع مشابه
Tenulin 0.25-hydrate, a sesquiterpene lactone isolated from Helenium amarum
The asymmetric unit of the title compound, C17H22O5·0.25H2O [systematic name: 2-hy-droxy-2,2a,6,9a-tetra-methyl-2a,4a,5,6,6a,9a,9b,9c-octa-hydro-2H-1,4-dioxadi-cyclo-pent[cd,f]azulene-3,9-dione 0.25-hydrate], a natural product isolated from Helenium amarum, contains two independent tenulin mol-ecules and half a water mol-ecule of crystallization situated on a twofold rotation axis. The hy-droxy...
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In a previous paper’ it was shown that when gluconic (A), galactonic (IS), glucoheptonic (C), and mannonic (D) acids are allowed to stand in aqueous solution, each forms two types of lactones. The lactone with a 6-membered ring forms rapidly but to a small extent, while the “5-ring” lactone forms slowly and to a larger extent. Each acid gives a curve for rate of lactone formation which is the r...
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The structure and absolute configuration of the title compound, C8H11NO4, which is a known quorum-sensing modulator, have been determined. The mol-ecule exhibits signs of an intra-molecular attractive carbon-yl-carbonyl n→π* inter-action between the amide and lactone ester groups, specifically - a short contact of 2.709 (2) Å between the amide oxygen atom and ester carbon atom, approach of the ...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1968
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.16.1601