Piperidine → 2-[[4-(Diethylamino)phenyl]methylene]-2,3-dihydro-3-hydroxy-1H-inden-1-one

Participants

Reaction Steps

A mixture of 56.6 g.(0.32 mole) of p-diethylaminobenzaldehyde, 47.36 g. (0.32 mole) of 3-hydroxy-1-indanone and 7 ml. of piperidine was then heated with magnetic stirring to 80°-100° C. for 1.5 hours (the mixture is a melt at the reaction temperature). The mixture was cooled in ice water, 90 ml. of 1-chlorobutane and seed was added. The product tended to come out as a gum; the solution was therefore heated, cooled (seeded) and muddy brown solid separated. The product was collected by filtration and the brown solid washed until bright orange; 43.62 g. 44% yield, m.p. 139°-141°, m.p. recrystallized material (1-chlorobutane) 142°-143° C. An extra 11% yield was obtained through concentration and refiltration of the filtrate; the latter fraction washed up as cleanly as the first. The IR spectrum and elemental analysis are those expected of the titled merocyanine derivative.

Provenance & Evidence