OXIDATION OF OLEFINS CATALYZED BY (HEDTA) RU(V)=O

The complex K[Ru(III)(HEDTA)Cl].H2O 1 and [(HEDTA) Ru(v) = O] 2 were p repared and characterised by elemental analysis, IR, UV-Vis spectrosco py, conductivity, magnetic susceptibility and electrochemical studies (HEDTA-hydroxyethyl-ethylene-diaminetriacetate anion). The kinetics of oxygen atom transfer of [Ru(III)(HEDTA) (H2O)] 1a to [(HEDTA) Ru(v) = O] 2 with iodosoylbenzene was studied spectrophotometrically by using stopped-flow technique. The oxygen atom transfer from complex 2 to cy clohexene, cyclooctene, styrene, cis and trans-stilbene was studied by the disappearance of the characteristic oxo peak (lambda(max) = 391 n m) at constant pH (3.0) and ionic strength (mu = 0.1 M NaClO4) and als o product analysis by gas chromatography (GC). The activation paramete rs for both the oxygenation of complex 1 to complex 2, and oxygen atom transfer from complex 2 to the organic substrates studied were evalua ted and suitable mechanisms proposed.