Baak, M., Rubin, Y., Franz, A., Stoeckli-Evans, H., Bigler, L., Nachbauer, J., & Neier, R. (1993). An Unexpected Tandem Reaction between N-Butadienyl-N-alkylketene N,O-Trimethylsilylacetals of Propionamide and Activated Dienophiles like N-Phenyl-maleimide or Acryloyl Chloride. CHIMIA, 47(6), 233. https://doi.org/10.2533/chimia.1993.233