Download Fortschritte der Chemie Organischer Naturstoffe / Progress by H. Barkemeyer, K. Bernauer, A.E. Dimond, H.H. Inhoffen, PDF
By H. Barkemeyer, K. Bernauer, A.E. Dimond, H.H. Inhoffen, K. Irmscher, F. Korte, I. Korte, H. Kuhn, W.A. Schroeder, B.B. Stowe, K. Venkataraman P.H. Abelson
Read or Download Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progres dans la Chimie des Substances Organiques Naturelles PDF
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Additional resources for Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progres dans la Chimie des Substances Organiques Naturelles
Xln. Biogenesis of Flavones and Isoflavones. The biogenesis of flavones and other flavonoids, which is the subject of a very recent and comprehensive review (28; d. 25), is part of the wider problem of aromatic biosynthesis. Biogenetic schemes based on the structural relations of natural products (I89) and on laboratory analogies have served their purpose; they have frequently led to the structure of a plant constituent by short cuts and to new methods of synthesis (I99). During the last few years experiments on plants using HC-labelled precursors have provided direct evidence of biosynthetic pathways for lignin, quercetin and tricin.
59- 69. Flavones and Isoflavones. ) R - H, Dlhydro·iso-osajin. R - OH, Dlhydro·iso·pomiferin. osage orange (Maclura pomifera) , and therefore very different in botanical origin. WOLFROM (226) has demonstrated the structures of osajin and pomiferin to be (XLVI); unlike jamaicin and munetone, the 2'-position in osajin and pomiferin is free. Osajin and pomiferin possess two ethylenic bonds which are saturated readily, but in two stages, by catalytic hydrogenation. When osajin and pomiferin are treated with sulphuric acid in glacial acetic acid, they cyclize to the isomeric iso-osajin and iso-pomiferin; dihydro-osajin and dihydro-pomiferin behave similarly, yielding dihydroiso-osajin and dihydro-iso-pomiferin (XLVII), the structures of which have been confirmed by synthesis starting from dihydro-iso-osajinol (XLVIII, p.
VENKATARAMAN: 7-methyl ether (rhamnetin). Fluorescence in acetic anhydride showed the absence of a free 5-hydroxyl group. The absorption spectrum of ... J