Summary
A study of the polymerizability of the first crystalline 1-azabutadiene carrying an electron-withdrawing group on nitrogen is described. A convenient one-step synthesis of 3-methyl-N-(phenylsulfonyl)-1-aza-1,3-butadiene (MPAB) from methacrolein and benzenesulfonamide using titanium tetrachloride and triethylamine led to a crystalline azabutadiene monomer in good yield. With anionic initiators the monomer readily oligomerized to materials in which MPAB has reacted in a 4,1-fashion. Under radical conditions the monomer did not homopolymerize, but did copolymerize with styrene monomers to polymers with molecular weights up to 10,000. These radical copolymerizations involved exlusive 4,3-propagation (vinyl) for the azadiene monomer.
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Bonner, B.A., Padias, A.B. & Hall, H.K. The polymerization of 3-methyl-N-(phenylsulfonyl)-1-aza-1,3-butadiene. Polymer Bulletin 28, 517–523 (1992). https://doi.org/10.1007/BF00296041
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DOI: https://doi.org/10.1007/BF00296041