SCHEDULED MAINTENANCE
The reaction of 3-acetyl-2H-1-benzopyran-2-ones with malononitrile affords dicyanomethylene derivatives which dimerise to 1-amino-3,5,5-bis(2-oxo-2H-1-benzopyran-3-yl)-5-methyl-1,3-cyclohexadiene-2,6,6-tricarbonitrile derivatives and related dimeric intermediate products.
C. N. O'Callaghan and T. Brian H. McMurry, J. Chem. Res. (S), 1999, 458 DOI: 10.1039/A902400J
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