Carbon-carbon bond forming reactions in supercritical carbon dioxide in the presence of a supported palladium catalyst

The reaction of aryl iodides or vinyl triflates with a variety of olefins i n supercritical carbon dioxide (scCO(2)), in the presence of triethylamine and palladium on carbon, has been investigated. Methyl acrylate, styrene an d acrylonitrile afford vinylic substitution products. Butenone reacts with aryl iodides to form a mixture of vinylic substitution and hydroarylation ( formal conjugate addition) products, n-Butyl, vinyl ether gives rise to the formation of products arising from the alpha- and beta-arylation process.