A facile high yielding process of guanidines is reported by reaction of amine nucleophiles on the oxidised thioureas in an aqueous medium using the unexploited reagents sodium chlorite and sodium metaperiodate for the oxidation of 1,3-disubstituted thioureas.
The present invention provides unimolecular metal complexes having increased activity in the copolymerization of carbon dioxide and epoxides. Also provided are methods of using such metal complexes in the synthesis of polymers. According to one aspect, the present invention provides metal complexes comprising an activating species with co-catalytic activity tethered to a multidentate ligand that is coordinated to the active metal center of the complex.
Guillemard, Bulletin de la Societe Chimique de France, 1905, vol. <3>33, p. 652