A Knoevenagel condensation is demonstrated in the reaction of 2-methoxybenzaldehyde 1 with the barbituric acid 2 in ethanol using piperidine as a base. The resulting enone 3 is a charge transfer complex molecule.

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A Knoevenagel condensation is demonstrated in the reaction of 2-methoxybenzaldehyde 1 with the barbituric acid 2 in ethanol using piperidine as a base. The resulting enone 3 is a charge transfer complex molecule.