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US 3,943,179 AGranted
Hydroxylation of aromatic compounds
AssigneeRhone-Poulenc-Textile
InventorsPierre-Etienne Bost, Michel Costantini, Michel Jouffret, Guy Lartigau
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Abstract
Phenols and phenol ethers are hydroxylated with hydrogen peroxide in the presence of sulphur, selenium, tellurium, phosphorus, arsenic or antimony. High yields of dihydric materials are obtained by this process which avoids the need to use peracids or very strong acids.
Claims7
A process for the hydroxylation of an aromatic compound of the general formula:
- ##SPC2##
- in which R and R', which may be identical or different, each represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, wherein the aromatic compound is treated with hydrogen peroxide at a temperature from 20.degree.to 150.degree.C. in the presence of at least one element which is sulphur, selenium, tellurium, phosphorus, arsenic or antimony, in an amount from 0.001 to 1 gram atom of element per mol of hydrogen peroxide, the molar ratio of hydrogen peroxide to aromatic compound being not greater than 0.3:1.
Dependencies are inferred from the claim text.