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Synthetic and mechanistic studies into the kinetic resolution of alpha-olefins using C1- and C2- symmetric zirconocene polymerization catalysts

Citation

Byers, Jeffery Allen (2007) Synthetic and mechanistic studies into the kinetic resolution of alpha-olefins using C1- and C2- symmetric zirconocene polymerization catalysts. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05162007-152948

Abstract

Mechanistic and synthetic investigations into the kinetic resolution of racemic alpha-olefins by polymerization catalysis using C1- and C2-symmetric zirconocenes are reported. The importance of chain end control as a stereocontrol element was probed with ethylene and propylene copolymerizations catalyzed by the C1-symmetric catalyst, {1,2-(SiMe2)2(eta-5-3,5-C5H1(CHMe2)2)(eta-5-4-C5H2((S)-CHMeCMe3)]}ZrCl2/MAO. Selectivity factors and pentad analysis of racemic alpha-olefin and propylene polymerizations catalyzed by a similar C1-symmetric catalyst, {1,2-(SiMe2)2(eta-5-3,5-C5H1(CHMe2)2)(eta-5-4-C5H2((S)-CHEtCMe3)]}ZrCl2/MAO, indicate that site epimerization does not limit selectivity during kinetic resolution.

To avoid some of the issues involved with the C1-symmetric catalysts, a route to enantiopure C2-symmetric zirconocenes was pursued. With the aid of the chiral auxiliary, (R)-N2,N2’-di-p-tolyl-1,1’-binaphtyl-2,2’-diamine, enantiospecefic synthesis of (S,S)-{C2H4-1,2-(1-indene)2}ZrCl2 was accomplished and its use for kinetic resolution was investigated. Although synthetically useful selectivities were not observed, it was determined that the C2-symmetric catalyst does not racemize during polymerization, which substantiates a more thorough investigation of catalysts based on {C2H4-1,2-(1-indene)2}ZrCl2.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:13C labeled olefin; asymmetric catalysis; swivel frit
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:
  • Stoltz, Brian M. (chair)
  • Bercaw, John E.
  • Peters, Jonas C.
  • Grubbs, Robert H.
Defense Date:24 May 2007
Record Number:CaltechETD:etd-05162007-152948
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-05162007-152948
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1839
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:31 May 2007
Last Modified:26 Dec 2012 02:42

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