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1-Hydroxy-3-methylxanthone

The methyl homologue, 1-hydroxy-3-methylxanthone, has been synthesised in 3 % yield from equimolar proportions of salicyloylurea and orcinol in the presence of orthophosphoric acid, phosphorus oxychloride and anhydrous zinc chloride by heating at 150 C for 5 hours (ref. 125). [Pg.306]

An improved product is reported to be obtained in higher yield if the cyclization of dihydroxybenzophenones is carried out at 210 °C in glycerol containing a trace of potassium hydroxide 3-hydroxy-4-methylxanthone was obtained in 50% overall yield from salicylic acid and 2-methylresorcinol, for example (75CJC2054). [Pg.835]

Dechloro-8-0-methylthiomelin, 1 -Hydroxy-2-chloro-5,8-dimethoxy-6-methylxanthone... [Pg.196]

See other pages where 1-Hydroxy-3-methylxanthone is mentioned: [Pg.445]    [Pg.870]    [Pg.945]    [Pg.445]    [Pg.870]    [Pg.945]    [Pg.435]    [Pg.652]    [Pg.415]   
See also in sourсe #XX -- [ Pg.306 ]



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Methylxanthone

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