Process for the preparation of .alpha.-alkylacroleins
AssigneeBASF SE
InventorsGerd Duembgen, Gerd Fouquet, Richard Krabetz, Ekhart Lucas, Franz Merger, Friedbert Nees
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Abstract
.alpha.-Alkylacroleins are prepared by a process wherein an alkanal is reacted with formaldehyde in the presence of a secondary amine and in the presence or absence, of an acid, in the liquid phase, under superatmospheric pressure and at above 150.degree. C., for not more than 25 minutes. The .alpha.-alkylacroleins obtainable by the process are useful starting materials for dyes, drugs and pesticides.
Claims10
In a process for the preparation of an .alpha.-alkylacrolein of the formula ##STR5## where R.sup.1 is n-alkyl of 1 to 8 carbon atoms which may be further substituted by alkoxy or alkyl of 1 to 4 carbon atoms, by reacting an alkanal of the formula
- R.sup.1 --CH.sub.2 --CHO (II),
- where R.sup.1 has the above meanings, with formaldehyde in the presence of a secondary amine in the presence or absence of an acid, at from 150.degree. to 300.degree. C.,
- the improvement which comprises carrying out the reaction in the liquid phase under superatmospheric pressure at above 150.degree. C. for not more than 25 minutes, using from 0.001 to 0.25 equivalent of amine per mole of alkanal II.
Dependencies are inferred from the claim text.