Summary
1-Aza-3-oxabicyclo[3.3.1]nonan-2-one, an N-bridgehead bicyclic urethane, polymerized in bulk under the influence of dibutyltin oxide and p-toluenesulfonic acid. In solution the monomer polymerizes in the presence of phosphoric acid. This is only the second example of ring opening polymerization of a bicyclo[3.3.1]nonane. The driving force in the present case is thought to be the relief of strain energy in the monomer conferred by its chair-boat conformation.
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Hall, H.K., El-Shekeil, A. Anti-bredt monomers. Polymer Bulletin 2, 829–836 (1980). https://doi.org/10.1007/BF00255511
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DOI: https://doi.org/10.1007/BF00255511