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A mixture of 6.17 g of 4-methoxy-3-methylbenzophenone, 65 ml of glacial acetic acid and 103 ml of a 62 percent hydrobromic acid solution is heated to boiling under reflux for 3 hours. The dark solution obtained is concentrated, extracted with ethyl acetate and the organic phase is dried and evaporated. The residue is chromatographed on silica gel with hexane:ethyl acetate (7:3). There are obtained 2.90 g (50%) of 3-methyl-4-hydroxybenzophenone as a yellowish solid with a m.p. of 170°-173° .

1. temperatureis heated
2. temperatureunder reflux for 3 hours
3. customThe dark solution obtained
4. concentrationis concentrated
5. extractionextracted with ethyl acetate
6. customthe organic phase is dried
7. customevaporated
8. customThe residue is chromatographed on silica gel with hexane:ethyl acetate (7:3)