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ChemicalBook CAS DataBase List 2,2'3,4,4'-PENTAHYDROXY BENZOPHENONE
92379-42-5

2,2'3,4,4'-PENTAHYDROXY BENZOPHENONE synthesis

3synthesis methods
Preparation by reaction of 2,3,4-trihydroxybenzoic acid with resorcinol,
? in the presence of zinc chloride and phosphorous oxychloride at 70–80° for 1.5 h (65%) ;
? in the presence of zinc chloride and a mixture of polyphosphoric acid/85% phosphoric acid (60:40) at 27°. Then, during 2h, phosphorous trichloride was added between 27° and 37° and the mixture heated at 60° for 16h.
-

Yield:-

Reaction Conditions:

with zinc(II) chloride;trichlorophosphate

References:

Grover et al. [Journal of the Chemical Society,1955,p. 3982,3984]

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