| 摘要 |
Oximino-substituted carbonyl compounds are prepared by reacting at temperatures of from 0 DEG to 80 DEG C. in the presence of an acid catalyst an aliphatic, cycloaliphatic or aliphatic-aromatic ketone, b -diketone and/or b -ketocarboxylic acid ester containing optional alkyl or halogen substituents and at least two hydrogen atoms bound to at least one of the carbon atoms vicinal to a carbonyl group with a gaseous mixture of oxides of nitrogen in which oxygen is bound to nitrogen at least in the proportion corresponding to the formula N2O3. Suitable mixtures of oxides of nitrogen may be obtained by the industrial oxidation of ammonia and, if desired, such mixtures may be admixed with air or oxygen before reaction with the carbonyl compound. Preferred acid catalysts are those which are known to be condensing agents and/or to be capable of forming nitrosyl compounds, e.g. sulphuric, hydrochloric and phosphoric acids, aluminium chloride, zinc chloride and acid ion-exchangers. The reaction is preferably discontinued after about 10 to 50% of the carbonyl compound has reacted. Examples describe the preparation of oximino-acetone, oximino-methyl ethyl ketone, oximino-diethyl ketone, oximino-methyl n-propyl ketone, oximino-acetyl-acetone, oximino-acetophenone, dioximino-cyclohexanone and oximino-acetoacetic ester.
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