6-Amino-4-aryl-5-cyano-2-methylpyran-3-carboxylates undergo cleavage and recombination when reacted with malononitrile, the products being 1-amino-3-aryl-2,6,6-tricyanocyclohexylidene-5-methylidenecarboxylates and related compounds.
C. N. O'Callaghan and T. Brian H. McMurry, J. Chem. Res. (S), 1999, 457 DOI: 10.1039/A902865J
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