Tuesday, 24 May 2005 - 9:30 AM

This presentation is part of: Inorganic and Organometallic Polymers III

Polymerisation of Ferrocenylboranes via BH3 Elimination or Hydroboration Reactions

Matthias Wagner, Matthias Scheibitz, and Julia B. Heilmann. J. W. Goethe-Universität, Frankfurt (Main), Germany

Syntheses, structures and reactivities of the ferrocenylborane adducts FcBH2-Do (Do = NMe2Et, SMe2) and of the corresponding 1,1'-disubstituted species are described (Fc = ferrocenyl). Thermolysis of FcBH2-NMe2Et gives the dinuclear hydroboration reagent Fc2BH and B2H6. The thioether adduct FcBH2-SMe2 undergoes a similar condensation reaction in solution even at room temperature. X-Ray crystallography revealed Fc2BH to be a rare example of a diorganylborane which is monomeric in the solid state. Ferrocenylborane derivatives FcBH2-Do may be used in the hydroboration polymerisation of aromatic diynes which yields π-electron deficient conjugated polymers with ferrocenyl substituents at the boron atoms (e.g. 1). Treatment of FcBBr2 with Et3SiH leads to the formation of diferrocenylbromoborane Fc2BBr in quantitative yield. Similarly, 1,1'-Fc(BBr2)2 and Et3SiH give the BBr-bridged polymer 2 (chain length: approximately 30 – 50 repeat units) which can be derivatised in a variety of ways to generate poly(ferrocenylenes) with cationic, neutral and anionic three- or four-coordinate boron bridges.

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