Methyl Acrylate → 4-(m-Chlorocinnamyl)-4-phenyl-5-oxo-7-(p-chlorophenyl)-6-heptenoic Acid

Participants

Reaction Steps

Triton B (1.5 ml., 40% in MeOH) is added to a stirred solution of 1-(p-chlorophenyl)-4-phenyl-7-(m-chlorophenyl)-1,6-heptadien-3-one (22.8 g., 0.056 mole) in glyme (175 ml.), followed by addition of methyl acrylate (5.76 g., 0.067 mole) in glyme (25 ml.). After stirring for 20 hours, the solvent is removed in vacuo and water (600 ml.) and dilute hydrochloric acid (25 ml.) are added to the residue. The organic material is extracted into ether and these extracts are washed with water, saturated brine and dried (Na2SO4). After removal of the solvent the residue is heated on a steam bath with a solution of 20% sodium hydroxide (25 ml.) in methanol (300 ml.) for 48 hours. The methanol is removed in vacuo and the residue is dissolved in water (1200 ml.). Extraction with ether removes unreacted ketone. Ether is expelled from the aqueous phase by warming. The solution is cooled in an ice bath, acidified with dilute hydrochloric acid (30 ml.), and the sticky yellow solid which precipitates is collected and air-dried, yield 4.5 g., m.p. 65°-105°C. Recrystallization from benzene-petroleum ether (30°-60°C.) followed by several recrystallizations from n-butyl chloride gives material with m.p. 150°-151°C.

Provenance & Evidence