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Hopan-22,28-diol

Stereoisomers of hopane as the parent hydroearbon of about 100 naturally abundant hopane triterpenes are isolated in small amounts from oil slate and petroleum of various provenanee. Hydroxylated hopanes sueh as (-l-)-6a,22-hopanediol are found to oeeur in some liehens and, assoeiated with (-l-)-22(29)-hopen-6a,2ip-diol, in the roots of Iris missouriensis (Liliaeeae). Neohopanes exemplified by (-l-)-12-neo-hopen-3p-ol from Rhododendron linearifolium (Erieaeeae) rarely oeeur as natural produets. [Pg.102]

Fig. 55. A 7p-Acetoxy-hopan-22-ol, An. Bar lOOjLim. B Hopan-15a, 22-diol, GE. Bar 100 pm. C Hopan-15a, 22-diol, GE. Bar 10 pm. D Hopan-15a, 22-diol, An. Bar 10 pm... Fig. 55. A 7p-Acetoxy-hopan-22-ol, An. Bar lOOjLim. B Hopan-15a, 22-diol, GE. Bar 100 pm. C Hopan-15a, 22-diol, GE. Bar 10 pm. D Hopan-15a, 22-diol, An. Bar 10 pm...
Deriv 6a-Acetoxy-7-oxo-hopan-22-ol, mp 229-230 °C, by oxidation of 6a-acetoxyhopan-7a,22-diol with Jones reagent StL Pseudocyphellaria crocata (L.) Vain. [Pg.365]

Deriv Hopan-15a,22-diol, mp 249 °C (benzene), [a]n + 34 (CHCI3, c 1.3), from 15a-aceto-xyhopan-22-ol by saponification with KOH-MeOH... [Pg.367]

Deriv Hopan-16p,22-diol, mp 268 °C, [a]i, + 68 (CHCI3), by saponification of 16P-aceto-xyhopan-22-ol with KOH-MeOH StL Parmelia entotheiochroa Hue Lit Yosioka et al. 1966c... [Pg.368]

Deriv 15a-Acetoxyhopan-22-ol, mp 200-201 °C (n-hexane), from hopan-15a,22-diol with AcjO-pyridine... [Pg.376]

Deriv 7-Oxohopan-22-ol, mp 256°C, [a]p - 31 (CHCI3), from hopan-7p,22-diol with Cr03-pyridine... [Pg.376]

Deriv 16p-Acetoxyhopan-22-ol,mp 228°C, [a]o + 52 (CHCI3), from hopan-16p,22-diol with ACjO-pyridine... [Pg.377]

A new hopane derivative, amphistictinic acid (488), has been isolated from Pseudocyphellaria amphisticta (273). The structural assignment followed principally from H-n.m.r. and mass spectral data and was confirmed by chemical conversion to hopane-15a,22-diol. [Pg.209]

See other pages where Hopan-22,28-diol is mentioned: [Pg.66]    [Pg.179]    [Pg.42]    [Pg.42]    [Pg.42]    [Pg.50]    [Pg.119]    [Pg.120]    [Pg.121]    [Pg.367]    [Pg.376]    [Pg.376]    [Pg.376]    [Pg.477]    [Pg.245]    [Pg.248]    [Pg.288]    [Pg.290]   
See also in sourсe #XX -- [ Pg.376 ]



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