A new set of ruthenium complexes such as 1 and 2 (the Grubbs ruthenium-carbene complex) has been shown to mediate the controlled atom-transfer radical polymerization (ATRP) of vinyl monomers with exceptional efficiency. Furthermore, there is a striking parallelism between the catalytic activity of these compounds in olefin metathesis and in ATRP.

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RuCl(Cp*)(PPh 3 ) 2 ] and [RuCl(Ind)(PPh 3 ) 2 ] are excellent catalyst precursors for promoting the Kharasch addition of CCl 4 and CHCl 3 across olefins under mild reaction conditions (at temperatures as low as 40°C with CCl 4 ). The effect of the substituents on the cyclopentadienyl ring has been investigated. In terms of efficiency and activity, [RuCl(Cp*)(PPh 3 ) 2 ][a]

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