Main > ORGANIC CHEMICALS > Olefin Metathesis > Catalysis. > Metal Carbene Catalyst. > Co.: Israel. Y (S Ylide Use/Patent) > NPLS Contents

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Sulfur ylide offers safer route to metal carbenes

A new general route to prepare metal carbene catalysts that are useful in olefin metathesis and other reactions has been developed. Interest in transition-metal benzylidene complexes of the type M=CHC6H5 has grown in recent years because of their catalytic properties. The usual synthesis of these complexes involves a diazoalkane as the carbene precursor, but the instability of diazo compounds and the safety issues involved with handling them hamper this method, the researchers note. The new method uses a sulfur ylide [(C6H5)2S=CHC6H5] as the carbene precursor, which they say is simpler and safer. The group has prepared several rhodium, ruthenium, and osmium carbene complexes using the ylide, including the versatile Grubbs catalyst [(PCy3)2Cl2Ru=CHC6H5, where Cy = cyclohexyl].




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