Abstract: An iodonium compound of formula (I): where RAR1 is a C5-6 aryl group, bearing at least one substituent selected from formyl, thionoacyl, acylamidocarboxy, thionoester, azo, C2-20 alkenyl, C2-20 alkynyl, and (CH2)nRC, where RC is selected from ether, amino, azo and thioether; RAR2 is a C5-10 aryl group, optionally substituted by one or more groups selected from C1-12 alkyl, C5-12 aryl, C3-12 heterocyclyl, ether, thioether, nitro, cyano and halo, and may be linked to a solid support or fluorous tag; and X is a counteranion.

Abstract: Decomposition of iodonium salts by a free radical process has been identified as a significant factor in the observed yield variability of fluoridation reactions using said iodonium salts. Accordingly, the inclusion of a free radical trap in the reaction mixture blocks the radical chain decomposition pathway for iodonium salts such that only the reaction leading to fluoridation can occur and the yield of aryl fluoride becomes high and reproducible. The reaction may also be carried out on solid phase. In both the solution and the solid phase the preferred method of the present invention is radiofluoridation.

Abstract: An iodonium compound of formula (I): where RAR1 is a C5-6 aryl group, bearing at least one substituent selected from formyl, thionoacyl, acylamidocarboxy, thionoester, azo, C2-20 alkenyl, C2-20 alkynyl, and (CH2)nRC, where RC is selected from ether, amino, azo and thioether; RAR2 is a C5-10 aryl group, optionally substituted by one or more groups selected from C1-12 alkyl, C5-12 aryl, C3-12 heterocyclyl, ether, thioether, nitro, cyano and halo, and may be linked to a solid support or fluorous tag; and X is a counteranion.

Abstract: A process for the transformation of an organic molecule catalyzed by a ligand-metal complex, is conducted in compressed CO2 as a solvent, wherein the complex comprises a perfluorinated group. Further, a process for the polymerization of a monomer containing two or more polymerizable groups, optionally together with another copolymerizable monomer, to give a cross-linked polymer in the form of essentially spherical particles, is conducted in compressed CO2 as a solvent, typically in the presence of a surfactant.