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US 6,274,775 B1Granted
Process for the preparation of nitrosobenzenes
AssigneeBayer Aktiengesellschaft
InventorsHenry Giera, Michaela Meiers, Uwe Hugger
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the preparation of nitrosobenzene from aromatic amines by oxidation with hydrogen peroxide in the presence of a catalyst based on compounds of tungsten and/or molybdenum without the addition of the organic solvents conventionally used.
Claims3
A process for the preparation of nitrosobenzenes of the general formula
- wherein
- R1 and R2 are identical or different and represent hydrogen, C1-C4-alkyl or C1-C4-alkoxy,
- comprising the step of oxidizing of corresponding aromatic amines, wherein the oxidation is carried out with hydrogen peroxide in the presence of an oxidation catalyst based on tungsten compounds, molybdenum compounds, and mixtures thereof at temperatures of 5 to 25° C. in the absence of an organic solvent at a molar ratio of aromatic amines to hydrogen peroxide to oxidation catalyst of(1):(2.0 to 5.0):(0.001 to 0.05).
Dependencies are inferred from the claim text.