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Didymic acid

CigHisO, Mr 344.32, yellow prisms, mp. 203 °C, [a] +495° and -495° (CHCl,), respectively. A biologically highly active dibenzofuran derivative, occurring both as the (+)- and the (-)-forms in numerous lichens (especially in Usnea species) antibiotic, antileukemic, growth regulatory (in plants), and antifeedant (in insects) activities have been described. It is used as the free acid and as the sodium salt in pharmaceutical preparations. The biosynthesis presumably proceeds via phenolic oxidation. Other dibenzofuran derivatives from lichens are didymic acid, pannaric acid, pla-codiolic acid, and schizopeltic acid. [Pg.680]

Fig. 48. A Didymic acid, GE. Bar lOjim. B Isousnic acid, GE. Bar lOOiLim. C Isousnic acid. An. Bar 100 tm. D Placodiolic acid, GE. Bar 100 jim... Fig. 48. A Didymic acid, GE. Bar lOjim. B Isousnic acid, GE. Bar lOOiLim. C Isousnic acid. An. Bar 100 tm. D Placodiolic acid, GE. Bar 100 jim...
Melting point below 200 °C condidymic acid, didymic acid, isodidymic acid, isoschizopeltic acid, melacarpic... [Pg.122]

Deriv Acetyldidymic acid, needles (nrhexane-benzene), mp 116°C, from didymic acid with AC2O-H2SO4... [Pg.220]

Carvalho CF, Sargent MV (1984b) Naturally occurring dibenzofurans. Part 5. Synthesis of melacarpic acid. J Chem Soc Perkin Trans 1 1613-1620 Carvalho CF, Sargent MV (1984c) Naturally occurring dibenzofurans. Part 6. Synthesis of didymic acid. J Chem Soc Perkin Trans 1 162 L-1626... [Pg.450]

Shibata S, litaka Y (1984) Renewed studies on the structure of didymic acid. Chem Pharm Bull 32 366-368 Shibata S, Furuya T, lizuka H (1965) Gas liquid chromatography of lichen substances. 1. Studies on zeorin. Chem Pharm Bull 13 1254-1257... [Pg.470]

Shibata, S., and Miura, Y. (1949). Antibacterial effects of lichen substances. II. Studies on didymic acid and related compounds. Jap. Med. J. 2, 22-24. [Pg.560]

PD—, K—, C+ greenish Didymic acid, pannaric acid, porphyrilic acid, strepsilin... [Pg.634]

Shibata and litaka 647) confirmed the structure of didymic acid by an X-ray analysis of its oxidation product 491 (see Scheme 151). [Pg.169]

Scheme 151. Oxidation of didymic acid to l-n-pentyl-2-methoxycarbonyl-3,6-dimethoxalyldibenzofuran... Scheme 151. Oxidation of didymic acid to l-n-pentyl-2-methoxycarbonyl-3,6-dimethoxalyldibenzofuran...
Carvalho CF, Sargent MV (1984) Naturally Occurring Dibenzofurans. Part 6. Synthesis of Didymic Acid. J Chem Soc Perkin I 1621... [Pg.241]

Shibata S, litaka Y (1984) Renewed Studies on the Structure of Didymic Acid. Chem Pharm Bull 32 366... [Pg.270]

See other pages where Didymic acid is mentioned: [Pg.78]    [Pg.36]    [Pg.50]    [Pg.86]    [Pg.116]    [Pg.122]    [Pg.219]    [Pg.11]    [Pg.554]    [Pg.556]    [Pg.11]    [Pg.170]    [Pg.173]   
See also in sourсe #XX -- [ Pg.219 ]

See also in sourсe #XX -- [ Pg.504 ]

See also in sourсe #XX -- [ Pg.11 , Pg.169 , Pg.170 , Pg.173 , Pg.178 ]



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