Patent ID: 6838575
Filing Date: 2005-01-04
Classification: B01J,C07C

Abstract:
1. A process for the preparation of a compound of formula: wherein: the wavy line indicates that the stereochemistry of the C═C double bond is not defined; R R R by reacting a starting ketone of formula: wherein R 1 and R 2 have the same meaning as in formula (I), with an aldehyde of formula: wherein R 3 bas the same meaning as in formula (I), in the presence of a metal complex of formula:  M(OR 8 ) 4-n X n   (VII) wherein M is a tetravalent metal cation selected from the group 4 consisting of Ti, 2r and Hf R 8 represents a C 1-6 linear or branched alkyl group, X represents an halide such as a Cl or F atom and the index n represents an integer from 1 to 3; and in the presence of a co-ingredient which is an alkyl or aromatic carboxylic acid anhydride containing 1 to 10 carbon atoms, BF 3 or an anhydrous salt selected from the group consisting of the sulfates, chlorides and bromides of a metal cation, wherein the metal cation is selected from the group consisting of Li + , Na + , K + , Cs + , Mg 2+ , Ni 2+ , Ca 2+ , Zn 2+ , Fe 3+ and Al 3+ .