| abstract |
The present invention relates to general catalysts of high activity and selectivity for the preparation of various esters, in particular acrylate and methacrylate-based esters, by transesterification reactions. This object comprises a combination of a metal 1,3-dicarbonyl complex (preferably Zn or Fe acetylacetonate) and salts, in particular inorganic salts, preferably ZnCl 2 , LiCl, NaCl, NH 4 Cl or LiI. Esters of carboxylic acids or carboxylic acids, especially saturated or unsaturated, generally 3-4 carbon atom carboxylic acids in the presence of a catalyst; It is made by reacting alcohol. These catalysts are prepared from starting materials that are readily available in the reaction medium (in situ preparation) without the need for separation. |