Selective hydroxylation of phenol or phenolic ethers

Details Selective hydroxylation of phenol or phenolic ethers Selective hydroxylation of phenol or phenolic ethers

C - Chemistry, Metallurgy

07

C

C07C 39/08 (2006.01) C07C 37/60 (2006.01) C07C 41/26 (2006.01) C07C 43/23 (2006.01)

Patent

CA 2152086

Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated using hydrogen peroxide in the presence of an amorphous or crystalline tin or cerium phosphate catalyst in a solvent containing an aliphatic carboxylic acid. The process is particularly suitable for phenol itself, and advantageously employs a catalyst obtained by heating an hydrated amorphous or crystalline tin or cerium phosphate for example at about 100°C. A convenient hydroxylation temperature is in the range of 50 to 90 °C, and a convenient solvent is acetic acid.

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