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Mild, multi-component Knoevenagel condensation/Michael addition reactions of dibenzoylmethane (Hdbm) and methylene-active cyano molecules with formalin in ethanol gave cyano methylene-bridged bis-diketones. The syntheses of 1,1,5,5-tetrabenzoyl-3,3-dicyanopentane (1) and 1,1,7,7-tetrabenzoyl-3,5-dicyano-3,5-dimethoxycarbonyl-heptane (4) are reported. Increasing the reaction time with the reagents...
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