Degree Type

Dissertation

Date of Award

1992

Degree Name

Doctor of Philosophy

Department

Chemistry

First Advisor

Thomas J. Barton

Abstract

Bicyclo (2.2.2) oct-1-ene 1 was generated by gas phase elimination of trimethylsilyl bromide from 1-bromo-2-(trimethylsilyl)-bicyclo (2.2.2) octane (2). The elimination was effected by passing vapors of 2 over solid-supported tetra-n-butyl ammonium fluoride at room temperature and reduced pressure. Three dimers of 1 were identified by their X-ray crystal structures. A pair of diastereomeric, head-to-head dimers, along with the previously known head-to-tail dimer demonstrate the non-ionic character of the Bredt olefin 1. Attempts to generate bicyclo (2.2.2) octa-1,2-diene are reported;Bicycloalkylidene carbenes are generated in the gas phase and in solution. Factors influencing the fate of these species are discussed. Force field calculations of a series of cyclic and bicyclic vinylidenes are reported and analyzed in the context of ring expansion versus ring contraction. Attempts to synthesize a low temperature, thermal precursor to bicyclic vinylidene are discussed.

DOI

https://doi.org/10.31274/rtd-180813-9525

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Nathan L. Anderson

Language

en

Proquest ID

AAI9311472

File Format

application/pdf

File Size

139 pages

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