Patent ID: 6313347
Filing Date: 2001-11-06
Classification: C07C

Abstract:
A process for the preparation of vinyloxime ethers of the formula I ##STR4##by reacting a ketoxime of the formula II ##STR5##with an alkyne of the formula IIIR.sup.3 -C=C-R.sup.4 (III)whereR.sup.1 and R.sup.2 are identical or different and are alkyl or aryl radicals,R.sup.3 is hydrogen, an alkyl or aryl radical, andR.sup.4 is a radical having the meaning of R.sup.3, which may be different than R.sup.3, or is a hydroxyalkyl radical,in a superbasic polar organic solvent in the presence of a strong base, which comprises carrying out the reaction at from 50 to 100.degree. C. and separating off the resulting vinyloxime ether by carrying out the reaction in the presence of an inert nonpolar organic solvent which is immiscible with the superbasic polar organic solvent and which is a good solvent for the resulting O-vinyloxime ether, such that the resulting vinyloxime ether stays in contact with the other constituents of the reaction mixture for only a short time so that it is unable to decompose or react to give secondary products to a substantial extent.