3-Bromopropionic acid → 3-(4-Chlorophenoxy)propionic acid

Beteiligte Stoffe

Reaktionsschritte

38.2 g of 1-chloro-2-(2,6-dichlorophenylthio)-3-p-chlorophenoxypropane [obtainable by reaction of 3-bromo-propionic acid with Na p-chlorophenolate to give 3-p-chlorophenoxypropionic acid, bromination to give 2-bromo-3-p-chlorophenoxypropionic acid, reaction with Na 2,6-dichlorothiophenolate to give 2-(2,6-dichlorophenylthio)-3-p-chlorophenoxypropionic acid, LiAlH4 reduction to give the alcohol and reaction with SOCL2 ]is heated at 120° with 40 g of imidazole for 5 hours, then cooled, worked up as usual and Ia of m.p. 175°-177° is obtained.

Herkunft & Nachweise