Constrained geometry catalyst olefin insertion

Taking into account that thermal conversion of diamido to imido species is not accessible to BnjCyclam zirconium complexes, the cyclization reaction is likely to occur by 1,2-insertion of the olefin moiety in the Zr-N bond (Scheme 25.4). This pathway was initially proposed by Tobin Marks for lanthanocene and constrained geometry zirconium complexes and was more recently also suggested for other group 4 metal catalysts [15, 16]. The activation of the olefin toward insertion may... 

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