Patent ID: 6156925
Filing Date: 2000-12-05
Classification: C07C

Abstract:
A process for the preparation of dialkyl phenylmalonates of formula I, ##STR8## wherein L.sup.1 and L.sup.2 each independently represent a fluoro or chloro atom;R.sup.1 represents a hydrogen or halogen atom or an alkyl or alkoxy group; andR represents an alkyl group, which comprises treating an phenylbromide of formula II ##STR9## wherein R.sup.1, L.sup.1 and L.sup.2 have the meaning given for formula I, with a dialkyl malonate of formula III ##STR10## wherein R has the meaning given, in an inert solvent in the presence of a base and a copper salt, wherein 1.0 mole of the phenylbromide of formula II is treated with the enolate obtained from 2.0 to 4.0 moles of the dialkyl malonate of formula III and 2.0 to 3.8 moles of the base.