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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.
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O'CALLAGHAN et al. (1999) studied this question.
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