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Zirconocenes as models for homogeneous Ziegler-Natta olefin polymerization catalysts

Citation

Brandow, Christopher Graham (2001) Zirconocenes as models for homogeneous Ziegler-Natta olefin polymerization catalysts. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/kxb2-wp19. https://resolver.caltech.edu/CaltechTHESIS:03192014-141855635

Abstract

Using density functional theory, we studied the fundamental steps of olefin polymerization for zwitterionic and cationic Group IV ansa-zirconocenes and a neutral ansa- yttrocene. Complexes [H2E(C5H4)2ZrMe]n (n = 0: E = BH2 (1), BF2 (2), AlH2(3); n = +: E = CH2(4), SiH2(5)) and H2Si(C5H4)2YMe were used as computational models. The largest differences among these three classes of compounds were the strength of olefin binding and the stability of the β-agostic alkyl intermediate towards β-hydrogen elimination. We investigated the effect of solvent on the reaction energetics for land 5. We found that in benzene the energetics became very similar except that a higher olefin insertion barrier was calculated for 1. The calculated anion affinity of [CH3BF3]- was weaker towards 1 than 5. The calculated olefin binding depended primarily on the charge of the ansa linker, and the olefin insertion barrier was found to decrease steadily in the following order: [H2C(C5H4)2ZrMe]+ > [F2B(C5H4)2ZrMe] ≈ [H2B(C5H4)2ZrMe] > [H2Si(C5H4)2ZrMe]+ > [H2Al(C5H4)2ZrMe].

We prepared ansa-zirconocene dicarbonyl complexes Me2ECp2Zr(CO)2 (E = Si, C), and t-butyl substituted complexes (t-BuCp)2Zr(CO)2, Me2E(t-BuCp)2Zr(CO)2 (E = Si, C), (Me2Si)2(t-BuCp)2Zr(CO)2 as well as analogous zirconocene complexes. Both the reduction potentials and carbonyl stretching frequencies follow the same order: Me2SiCp2ZrCl2> Me2CCp2ZrCl2> Cp2ZrCl2> (Me2Si)2Cp2ZrCl2. This ordering is a result of both the donating abilities of the cyclopentadienyl substituents and the orientation of the cyclopentadiene rings. Additionally, we prepared a series of analogous cationic zirconocene complexes [LZrOCMe3][MeB(C6F5)3] (L = CP2, Me2SiCp2, Me2CCP2, (Me2Si)2Cp2) and studied the kinetics of anion dissociation. We found that the enthalpy of anion dissociation increased from 10.3 kcal•mol-1 to 17.6 kcal•mol-1 as exposure of the zirconium center increased.

We also prepared series of zirconocene complexes bearing 2,2-dimethyl-2-sila-4-pentenyl substituents (and methyl-substituted olefin variants). Methide abstraction with B(C6F5) results in reversible coordination of the tethered olefin to the cationic zirconium center. The kinetics of olefin dissociation have been examined using NMR methods, and the effects of ligand variation for unlinked, singly [SiMe2]-linked and doubly [SiMe2]-linked bis(cyclopentadienyl) arrangements has been compared (ΔG‡ for olefin dissociation varies from 12.8 to 15.6 kcal•mol-1). Methide abstraction from 1,2-(SiMe2)25-C5H3)2Zr(CH3)-(CH2CMe2CH2CH = CH2) results in rapid β-allyl elimination with loss of isobutene yielding the allyl cation [{1,2-(SiMe2)25-C5H3)2Zr(η3-CH2CH=CH2)]+.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Bercaw, John E.
Thesis Committee:
  • Unknown, Unknown
Defense Date:13 April 2001
Record Number:CaltechTHESIS:03192014-141855635
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:03192014-141855635
DOI:10.7907/kxb2-wp19
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8148
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:19 Mar 2014 23:02
Last Modified:16 Apr 2021 22:13

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