Cobalt-Catalyzed C─H Oxidation of Alkanes and Postfunctionalization of Polyolefin Elastomers.

This study focuses on the postfunctionalization of polyolefin elastomers (POEs) through direct C─H activation using a novel cobalt-based catalytic system. The investigation, initiated with the oxidation of cyclohexane, identified the cumene hydroperoxide (CumHPO) as the optimal oxidant and ligands L3, L4, and L7 as effective in chlorinated benzene solvents. Cobalt catalyst (Cat. 1) demonstrated superior activity in the oxidation of octadecane, achieving a 42% yield with a minimal amount of catalyst. The catalytic system was successfully extended to the C─H oxidation of POE, introducing functional groups in solvents like 1,2-Cl2C6H4 and 1,2,4-Cl3C6H3. Our findings propose a simple and green approach for the postfunctionalization of POE, offering versatility and potential for broader applications in the field of polymeric compounds.