| 摘要 |
PCT No. PCT/GB93/02519 Sec. 371 Date Aug. 3, 1995 Sec. 102(e) Date Aug. 3, 1995 PCT Filed Dec. 9, 1993 PCT Pub. No. WO94/14740 PCT Pub. Date Jul. 7, 1994Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated selectively 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 DEG C. A convenient hydroxylation temperature is in the range of 50 DEG to 90 DEG C., and a convenient solvent is acetic acid. |
