Thionyl Chloride → 2,2-Dimethyl-3-(2-trifluoromethyl-2-phenyl-vinyl)-cyclopropanecarboxylic acid chloride

Participants

Reaction Steps

7.1 g (0.025 mol) of 2,2-dimethyl-3-(2-trifluoromethyl-2-phenyl-vinyl)-cyclopropanecarboxylic acid were dissolved in 100 ml of carbon tetrachloride, and 9 g of thionyl chloride were slowly added dropwise at 25° C., while stirring. The mixture was then heated to the reflux temperature for 4 hours. After this reaction time, excess thionyl chloride and carbon tetrachloride were distilled off under a waterpump vacuum. The oil which remained was freed from last residues of solvent by brief incipient distillation at a bath temperature of 40° C./2 mm Hg. 7 g (92.7% of theory) of 2,2-dimethyl-3-(2-trifluoromethyl-2-phenyl-vinyl)-cyclopropanecarboxylic acid chloride were obtained. The structure was confirmed by the 1H-NMR spectrum.

Provenance & Evidence