Selective hydroxylation of phenol or phenolic ethers
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United States of America Patent
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Oct 7, 1997
Grant Date -
N/A
app pub date -
Aug 3, 1995
filing date -
Dec 19, 1992
priority date (Note) -
Expired
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Abstract
Phenols, 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.degree. C. A convenient hydroxylation temperature is in the range of 50.degree. to 90.degree. C., and a convenient solvent is acetic acid.
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