Patent ID: 6344589
Filing Date: 2002-02-05
Classification: C07C

Abstract:
A process for preparing bis(oxime) monoethers of the formula I, where:R1 is unsubstituted C1-C4-alkyl or C2-C4-alkenyl-, C2-C4-alkynyl- or phenyl-substituted methyl; R2,R4 independently of one another are hydrogen or methyl; R3,R5 independently of one another are hydrogen or C1-C4-alkyl, trifluoromethyl or phenyl, which comprisesa) treating an acetoacetic ester of the formula II with a nitrite initially under alkaline conditions and subsequently under acid conditions andb) alkylating the resulting monooxime III in the presence of a base to give the mono(oxime ether) IV and finallyc) reacting the mono(oxime ether) IV with hydroxylamine or its acid addition salt to give the bis(oxime) monoether I.