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A reaction of the Fries type was used: ##STR4## 32 g of Gallic acid, 32 g of pyrogallol, 55 g of anhydrous zinc chloride and 100 cm3 of phosphorus oxychloride were mixed in a balloon flask equipped with a condenser and an ampoule of calcium chloride, and were heated to 80° C for 2 hours. After cooling the reaction mixture, a mixture of water and ice was added, whereupon the reaction product precipitated. The reaction product was washed once with water, treated with a solution of sodium bicarbonate, then washed again with water, and finally recrystallised from aqueous solution. Yield: 15 g of crystalline 2,3,3',4,4',5'-hexahydroxybenzophenone having a melting point of 270° C.

1. customA reaction of the Fries type
2. customequipped with a condenser
3. temperatureAfter cooling the reaction mixture
4. additionwas added, whereupon the reaction product
5. customprecipitated
6. washThe reaction product was washed once with water
7. additiontreated with a solution of sodium bicarbonate
8. washwashed again with water
9. customfinally recrystallised from aqueous solution