Phase selective soluble polymers are useful in organic synthesis because they
simplify purification and separation processes. Such selective soluble polymers enable
the use of Green chemistry principles to be utilized as ways to simplify catalyst, reagent,
and product recovery. Polyisobutylene oligomers serve as examples of such polymers.
Vinyl terminated polyisobutylene (PIB) oligomers can be easily transformed into a
variety of end-functionalized PIB oligomers. Previous work has shown that PIB
oligomers possess nonpolar phase selective solubility that allows them to be used as
polymer supports for ligands and catalysts in liquid/liquid biphasic systems. This
dissertation focuses on the use of PIB oligomers as supports for a salen Cr(III) complex,
a Hoveyda-Grubbs 2nd generation catalyst, and a N-heterocyclic carbene. The syntheses
of these PIB-supported ligands and catalysts are simple and straightforward. The
synthetic products and the intermediates in these syntheses can all be readily analyzed
and monitored by conventional spectroscopic methods. The activity of the PIBsupported
catalysts is shown to be analogous to that of other soluble polymer supported
catalysts or their non-supported analogs. The PIB-bound catalysts can be separated from products by a latent biphasic, liquid/liquid extractions, or product self-separation
systems. The recovered PIB-bound catalysts can then be recycled multiple times.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2008-12-238 |
| Date | 14 January 2010 |
| Creators | Hongfa, Chayanant |
| Contributors | Bergbreiter, David E. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation |
| Format | application/pdf |
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