Reaction of {(Me3Si)2N)2Zr(CH2Ph)2 1 with B(C6F5)3 gives a cationic benzyl complex, which at -25 "C, expels toluene to afford [ (Me3Si)2N}Zr(CH2SiMe2NSiMe3){ qn-PhCH2-B(C6F5)3} 2; strong anion coordination to zirconium in cyclometallation product 2 suppresses alkene polymerization, whereas the analogous cationic NMe2Ph adduct 3, formed by protonolysis of 1, polymerizes both ethene and propene.
Reaction of ( ~l 5 -C ~M e ~) ~T i -n e o -C ~H ~~ with [ ~p M o ( C 0 ) ~] ~ (cp = v5-C5H5) yields the title compound (1); X-ray analysis of (1) shows a 4e (a, JC) Ti-0 interaction, resulting in a novel linear co-ordination of titanium to a bridging carbonyl and a new geometry of a [ c p M 0 ( C 0 ) ~] ~ fragment caused by a dLd6 (Mo-Mo) electron count.
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