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A Valence Bond Analysis of Olefin Polymerization Catalysts Timothy K. Firman and Tom Ziegler.

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Presentation on theme: "A Valence Bond Analysis of Olefin Polymerization Catalysts Timothy K. Firman and Tom Ziegler."— Presentation transcript:

1

2 A Valence Bond Analysis of Olefin Polymerization Catalysts Timothy K. Firman and Tom Ziegler

3  -Conjugated Ligands in d 0 Systems X groups are isolobally analogous Several good catalysts of this type are known

4 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

5 Model Compounds X= CH 2, SiH 2, NH, PH, O, S

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