SELECTIVE OLEFIN METATHESIS OF BIFUNCTIONAL OR POLYFUNCTIONAL SUBSTRATES IN COMPRESSED CARBON DIOXIDE AS REACTION MEDIUM

摘要

Cyclic products are prepared by selective olefin metathesis ofbifunctional or polyfunctional substrates in the presence ofone or several homogeneous or heterogeneous metathesiscatalysts in a reaction medium. The invention is characterized inthat the substrates contain two or more functional groups inthe form of substituted or non-substituted alkene or alkyneunits and in that the reaction medium essentially consists ofcompressed carbon dioxide. Also disclosed is the preparation ofcyclic or polymer products according to the disclosed process,the reaction temperature and total pressure being matched toensure that the density of the reaction medium lies in a ranged = 0.2-1.5 g-cm-3 and that the product distribution isessentially controlled by the reaction medium density.