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US 9,850,263 B2Granted
Process for preparing phosphorus containing cyanohydrins
AssigneeBayer CropScience AG
InventorsHans-Joachim Ressel, Kilian Tellman, Mark James Ford, Martin Littmann, Friedrich August Muehlthau, Guenter Schlegel
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Abstract
The present invention relates primarily to a process for preparing certain phosphorus-containing cyanohydrins of the formula (I), and also to certain phosphorus-containing cyanohydrins per se and to their use for the preparation of glufosinate and/or glufosinate salts. The present invention further relates to certain mixtures particularly suitable for preparing the phosphorus-containing cyanohydrins of the formula (I).
Claims13
Process for preparing a compound of formula (I)
- comprising reacting a compound of formula (II)
- with a cyanohydrin of formula (III)
- at a temperature in a range from 50 to 105° C.,
- where in each case:
- R1 is (C1-C12)-alkyl, (C1-C12)-haloalkyl, (C6-C10)-aryl, (C6-C10)-haloaryl, (C7-C10)-aralkyl, (C7-C10)-haloaralkyl, (C4-C10)-cycloalkyl or (C4-C10)-halocycloalkyl,
- R2 is (C1-C12)-alkyl, (C1-C12)-haloalkyl, (C6-C10)-aryl, (C6-C10)-haloaryl, (C7-C10)-aralkyl, (C7-C10)-haloaralkyl, (C4-C10)-cycloalkyl or (C4-C10)-halocycloalkyl,
- R3 and R4 are in each case independently of one another hydrogen, (C1-C4)-alkyl, phenyl or benzyl,
- X is oxygen or sulphur, and
- n is 0 or 1.
6 more elements
Dependencies are inferred from the claim text.