Patent ID: 7071351
Filing Date: 2006-07-04
Classification: C07C

Abstract:
1. A transesterification process, comprising: preparing a compound of formula I: wherein R 1 is hydrogen or methyl, R 3 is hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl or t-butyl, R 4 is methyl, ethyl, propyl, isopropyl, butyl, isobutyl or t-butyl, and R 5 is methylene, ethylene, 1,3-propylene, 1,4-butylene, 2-methyl-ethylene or 2,2-dimethyl-propylene by reacting a compound of formula II wherein R 1 is as defined above and R 2 is hydrogen, methyl or ethyl with a compound of formula III wherein R 3 , R 4 and R 5 are as defined above, in the presence of a catalyst of zirconium acetylacetonate in an amount ranging from 0.1–5% by weight, based on the total weight of the reactants.