Patent ID: 6903221
Filing Date: 2005-06-07
Classification: C07C,C07D

Abstract:
1. A process for preparing β-ketoenol esters of the formula Ia or Ib in which R R Ar is phenyl or pyridyl, which may in each case have 1, 2, 3 or 4 substituents, it also being possible for two substituents attached to adjacent carbon atoms to form, together with these atoms, a 5- or 6-membered saturated or unsaturated carbocycle or a 5- or 6-membered saturated or unsaturated heterocycle which has 1, 2 or 3 hetero atoms selected from the group consisting of O, N and S and which for its part may be substituted or unsubstituted; which comprises reacting an aryl halide of the formula II in which Hal is bromine with a 1,3-diketone of the formula III or its tautomer III′ or III″ in a carbon monoxide atmosphere in the presence of a base and a catalyst which comprises at least one transition metal of group VIII of the Periodic Table of the Elements.