Patent ID: 9464038
Filing Date: 2016-10-11
CPC Classification: C07C,C07F

Claim Text:
1. Method for preparing an oxime of formula (Va) or an oxime O-methyl ether of formula (Vb) in which R R R in which the residues R 3 and R 4 have the meanings mentioned above and the compounds (II) have a solubility in water of 0 to 30 g/l, optionally 0 to 20 g/l at 20° C., with the free base of hydroxylamine of the formula (III) or with a salt of hydroxylamine or hydroxylamine O-methyl ether of the formula (IV) in which R R′ B in the presence of a phosphoric ester of formula (I) and/or a salt thereof, in which X is OH and R in an at least biphasic mixture consisting of an aqueous and organic phase wherein the pH (at RT) in the aqueous phase during the reaction is in a range of 2 to 10.