The salts [Ru(Cp*)(CH 3 CN)(N,N)](PF 6 ), 6 ( N, N = bipyridine, 4,4′-dimethylbipyridine, and phenanthroline), react with allyl carbonates to afford new complexes that contain tethered ligands derived from deprotonation of one Cp* methyl group. The new Ru tetramethyl Cp complexes contain a CH 2 CHRCH═CH 2 fragment (R = H or Ph), which coordinates to the metal via the double bond. The salts 6 isomerize the branched carbonate PhCH(OCO 2 Bu t )CH═CH 2 to the linear isomer.
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Caldwell et al. (2008) studied this question.
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