(4-Nitrophenyl)acetic acid → 4'-Dibutylamino-4-nitrostilbene

Participants

Reaction Conditions

Reaction Steps

A mixture of 5.00 g (21 mmol) of 4-dibutylaminobenzaldehyde, 4.27 g (24 mmol) of 4-nitrophenylacetic acid, 1.80 g (21 mmol) of piperidine, and 50 mL of xylenes was heated with stirring at reflux of 20 hours with continuous removal of water using a Dean-Stark apparatus. The mixture turned dark red. Approximately half the xylenes was distilled, 20 mL of heptane was added, and the residue was cooled to -30° C. Red crystals separated which were collected and then recrystallized from toluene/heptane. Yield: 2.81 g (37%), mp 117-119 (lit2 182°-182.5° C.).

Provenance & Evidence