Methanol → Permethric acid

Participants

Reaction Steps

To 120 ml of methanol solution containing 4.8 g of sodium hydroxide were added 11.1 g of 2,2-dimethyl-3-(2',2',2'-trichloroethyl)-cyclopropanecarboxylic acid (purity: 91.8%, cis/trans ratio: 82.8/17.2) to heat the resulting mixture for 37 hours under reflux. The mixture was diluted with water and neutral part was removed by extraction with ether. The water layer was acidified with conc. hydrochloric acid and extracted with ether. The ether layer was concentrated to obtain 8.15 g of 2,2-dimethyl-3-(2',2'-dichlorovinyl)-cyclopropanecarboxylic acid, cis/trans ratio 79.8/20.2, purity 92.4%, yield 86.8%.

Provenance & Evidence