Baak, Marcel, Yves Rubin, Andreas Franz, Helen Stoeckli-Evans, Laurant Bigler, Jürgen Nachbauer, and Reinhard Neier. 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.