text: His main interests in organometallic chemistry and synthetic chemistry are catalysts , notably Grubbs ' catalyst for olefin metathesis and ring-opening metathesis polymerization with cyclic olefins such as norbornene .
simplified: His main interest is for organometallic chemistry and organic chemistry . These interests are for catalysts , such as Grubbs ' catalyst for olefin metathesis and ring-opening metathesis polymerization and norbornene .