The Suzuki–Miyaura cross-coupling of bromo- and chloroarenes with arylboronic acids in supercritical carbon dioxide

Haloarenes ArHal (Hal = Br, Cl) react with arylboronic acids in supercritical carbon dioxide in the presence of a system comprising Pd(OCOCF₃)₂/Buchwald phosphine ligand/potassium carbonate (phosphate)/18-crown-6 to yield the corresponding cross-coupling products in high yields; all chlorine atoms in di- and tetrachloroarenes are replaced by aryl groups under the proposed conditions.