A Valence Bond Analysis of Olefin Polymerization Catalysts Timothy K. Firman and Tom Ziegler
-Conjugated Ligands in d 0 Systems X groups are isolobally analogous Several good catalysts of this type are known
Resonance Structures A localized bonding picture of these ligands requires multiple resonance structures, e.g.: Main group elements require an octet of electrons Bond order to metal is variable, which may facilitate bond breaking during olefin insertion
Model Compounds X= CH 2, SiH 2, NH, PH, O, S