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US 2002/0165414 A1Published application
Process for the production of 2,2,6-trimethylcyclohexane-1, 4-dione
AssigneeDegussa AG
InventorsSteffen Krill, Klaus Huthmacher, Sylvain Perrin
Life of this patent
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Abstract
Process for the production of 2,2,6-trimethylcyclohexane-1,4-dione by epoxidation of β-isophorone with organic percarboxylic acids at a water content below 5 wt.-% and subsequent isomerization of the mixture of β-isophorone epoxide and hydroxyisophorone.
Claims20
A process for the production of dihydroketoisophorone (2,2,6-trimethylcyclohexane-1,4-dione) represented by the structure
- 7
- comprising reacting β-isophorone (3,5,5-trimethylcyclohex-3-en-1-one) represented by the structure
- 8
- with an organic percarboxylic acid in the form of its non-aqueous solution in an inert organic solvent at a temperature of 0° C. to 300° C., the percarboxylic acid used as oxidizing agent being formed in a pre-determined equilibrium and absorbed or extracted with the solvent used for oxidation, thereby forming:
- a mixture of β-isophorone epoxide
- 9
- and its isomer 4-hydroxyisophorone (HIP),
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- isomerizing said mixture “in situ” thermally or in the presence of an acid catalyst or in the presence of a salt.
6 more elements
A process for the production of an intermediate mixture of the β-isophorone epoxide represented by the structure:
- 11
- and its isomer-4-hydroxyisophorone (HIP),
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- comprising reacting β-isophorone (3,5,5-trimethylcyclohex 3-en-1-one) represented by the structure
- 13
- with an organic percarboxylic acid in the form of its non-aqueous solution in an inert organic solvent at a temperature of 0° C. to 300° C., the percarboxylic acid used as oxidizing agent being formed in a pre-determined equilibrium and absorbed or extracted with the solvent used for oxidation, to thereby obtain an intermediate mixture
3 more elements
A process for the production of dihydroketoisophorone (2,2,6-trimethylcyclohexane-1,4-dione) represented by the structure
- 14
- comprising reacting β-isophorone (3,5,5-trimethylcyclohex-3-en-1-one) represented by the structure
- 15
- with an organic percarboxylic acid in the form of its non-aqueous solution in an inert organic solvent at a temperature of 0° C. to 300° C., the percarboxylic acid used as oxidizing agent being formed in a pre-determined equilibrium and absorbed or extracted with the solvent used for oxidation, thereby forming:
- a mixture of β-isophorone epoxide
- 16
- and its isomer 4-hydroxyisophorone (HIP),
- 17
- isomerizing said mixture “in situ” thermally or in the presence of an acid catalyst or in the presence of a salt.
6 more elements
Dependencies are inferred from the claim text.