Preparation of 2,3-dichloro-3-phenylpropanoic acid
Direct sunlight or some other source of ultra-violet rays is essential for this preparation. 10 g of finely ground cinnamic acid are suspended in 80 g of freshly distilled carbon disulfide in a qartz flask. A stream of dry gaseous chlorine gas is passed in until the liquid assumes a greenish-yellow color. The mixture is alternately shaken until this color disappears, and re-saturated with gaseous chlorine gas until an increase in weight of 5 g has taken place. The precipitate is filtered off and recrystallized from aqueous alcohol. The yield of 2,3-dichloro-3-phenylpropanoic acid is 90% theoretical (14 g.). 2,3-Dichloro-3-phenylpropanoic acid forms colourless leaflets; m.p. 162-164 °C (slight decomposition).
Systematic organic chemistry, by W. M. Cumming, 340, 1937.
2,3-dichloro-3-phenylpropanoic acid, Benzenepropanoic acid, a,b-dichloro-, 35115-76-5, NSC122942, Cinnamic acid dichloride, AC1L5IKF, AC1Q3GJQ, SCHEMBL6548610, CTK4H3681, 2,3-dichloro-3-phenyl-propanoicacid, AR-1D2431, AKOS022653161, NSC-122942, OR053734, OR261322, 2,3-DICHLORO-3-PHENYL-PROPANOIC ACID