Method for producing organic hydroxylamines
AssigneeConsortium fur Elektrochemische Industrie GmbH
InventorsJohannes Freudenreich, Jürgen Stohrer
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Abstract
According to the inventive method for producing organic hydroxylamines, at least one organic nitro compound is partially hydrogenated in the presence of an organic base or ammonia, a trivalent phosphor compound and a hydrogenation catalyst. The invention is characterised in that quantities of the nitrogen base of more than 10 wt. % in relation to the organic nitro compound are used.
Claims10
A process for preparing organic hydroxylamines, in which an organic nitro compound is partially hydrogenated in the presence of an organic base or ammonia, a trivalent phosphorus compound and a hydrogenation catalyst, wherein the organic base is used in an amount of greater than 10% by weight based on the organic nitro compound.
A process for preparing organic hydroxylamines of the formula I or II
- where Ar1 is an unsubstituted or substituted isocyclic or heterocyclic aryl radical and Alk1 is an unsubstituted or substituted alkyl radical, by partial hydrogenation of organic nitro compounds of the formula III or IV
- Ar1—NO2 III
- Alk1—NO2 IV
- where Ar1 and Alk1 are as defined above, in the presence of a hydrogenation catalyst comprising at least one element of transition group VII or VIII of the Periodic Table and at least one nitrogen base and at least one trivalent phosphorus compound, wherein the nitrogen base and the nitro compound are used in a weight ratio of nitrogen base to nitro compound of greater than 0.1 and the trivalent phosphorus compound is used in an amount of 0.0001-3 mol % based on the nitro compound.
Dependencies are inferred from the claim text.