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US 6,476,253 B1Granted
Process for preparing monoacetylated hydroquinone compounds
AssigneeBASF SE
InventorsKarin Schein, Kai-Uwe Baldenius, Wolfgang Siegel, Rainer Stürmer, Detlef Ruff, Hagen Jaedicke
Life of this patent
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Abstract
The present invention relates to a process for preparing monoacetylated hydroquinone compounds of the formula I, to the novel final products of the process and to a process for preparing the precursors.
Claims8
A process for preparing monoacetylated hydroquinone compounds of the formula I
- where
- R1, R2 and R3 are, independently of one another, hydrogen or methyl, which comprises reacting diacetylephenol compounds of the formula II
- with peroxo compounds, where appropriate in the presence of an acid.
A process for preparing diacetylphenol compounds of the formula II
- where
- R1, R2 and R3 are, independently of one another, hydrogen or methyl, which comprises reacting phenol compounds of the formula III
- with an acetylating agent in the presence of an acidic catalyst.
A process for preparing monoacetylated hydroquinone compounds of the formula I
- where
- R1, R2 and R3 are, independently of one another, hydrogen or methyl, which comprises reacting phenol compounds of the formula III
- with an acetylating agent in the presence of an acidic catalyst to give the diacetylphenol compounds of the formula II
- and reacting the latter with peroxo compounds, where appropriate in the presence of an acid.
1 more element
A compound of the formula Ia, Ib, Ic, or Id
Dependencies are inferred from the claim text.