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US 10,214,484 B2Granted
Method for preparing acrolein cyanohydrins
AssigneeEvonik Degussa GmbH
InventorMarianne Omeis
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Abstract
The present invention relates to an improved method for preparing acrolein cyanohydrins from hydrocyanic acid and the corresponding acroleins. The method is characterized in that the acrolein cyanohydrins obtained have a very low hydrocyanic acid content or are free of hydrocyanic acid and are therefore particularly well suited as intermediates for the synthesis of glufosinates.
Claims17
A method for preparing a compound of formula (I)
- the method comprising:
- (a) reacting at least one compound of the formula (II)
- with hydrocyanic acid and at least one base B, whereby a crude product CP comprising the compound of formula (I) and hydrocyanic acid is obtained;
- and
- b) at least partially removing hydrocyanic acid from the crude product CP by subjecting the latter to stripping, whereby a pure product comprising the compound (I) is obtained, wherein the pure product has a reduced content of hydrocyanic acid compared to CP,
- wherein the stripping is carried out at a pressure of <1 bar,
- wherein optionally an inert stripping gas is used in countercurrent flow, and
- wherein R1 and R2 are each independently hydrogen, an alkyl group, phenyl, or benzyl.
5 more elements
Dependencies are inferred from the claim text.