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A Flexible and Modular Approach to [2]Ferrocenophanes with Nitrogen in Bridging Position

dc.contributor.advisorMueller, Jens
dc.contributor.committeeMemberWard, Dale
dc.contributor.committeeMemberFoley, Stephen
dc.contributor.committeeMemberBowles, Richard
dc.creatorDey, Subhayan 1987-
dc.creator.orcid0000-0002-5910-0423 2016
dc.description.abstract[n]Ferrocenophanes are interesting because these strained sandwich compounds can be polymerized to metallopolymers by ring-opening polymerization reactions. Although there are many strained [n]ferrocenophanes known, only few of them can be polymerized with controlled molecular weight and molecular weight distribution. Among them, the Me2¬Si-bridged [1]ferrocenophane is the mostly explored species. To expand the possibility of accessible monomers we synthesized a new class of strained [2]ferrocenophanes. Although there are plenty of examples of symmetrically bridged [2]ferrocenophanes known, similar species with two different bridging elements are comparatively rare. In order to induce a difference in polarity over the diatomic bridge, nitrogen was introduced in the bridging position. Via a known synthetic methodology, one bromine of 1,1'-dibromoferrocene was selectively replaced by an amino group. The resulting compound was then modified into a class of easily synthesizable starting materials which were cleanly lithiated under optimized condition and in-situ reacted with different elemental dihalides to produce unsymmetrically bridged aza[2]ferrocenophanes. This is the first reported development of a modular synthetic approach towards this class of strained sandwich compounds. Aza[2]ferrocenophanes with boron, gallium, silicon, tin, and phosphorus as the second bridging element were prepared and characterized. Among these strained compounds, only the silicon- and tin-bridged species have been investigated for ring-opening polymerizations. However, no polymeric materials were obtained from these reactions. The preparation of azaphospha[2]ferrocenophanes was surprisingly difficult and led to unexpected products like 1,1'-disubstituted ferrocenes and azacarbaphospha[3]ferrocenophane.
dc.subjectMetallocenophane, Ferrocenophane, Silicon, Tin, Phosphorus, Boron, Ring-Opening Polymerization, Metallopolymers.
dc.titleA Flexible and Modular Approach to [2]Ferrocenophanes with Nitrogen in Bridging Position
local.embargo.terms2017-10-07 of Saskatchewan of Philosophy (Ph.D.)


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