Sodium Carbonate → benzofuran-3-one O-methyl oxime

Participants

Reaction Steps

74 g (0.303 mol) of 2-bromo-1-(2-hydroxy-phenyl)-ethanone O-methyl-oxime are dissolved in 350 ml of tert-butyl methyl ether and heated under reflux with a solution of 40 g (0.377 mol) of sodium carbonate in 400 ml of water with vigorous stirring for 5 days. The organic phase is separated off and dried over sodium sulphate and the solvent is distilled off under reduced pressure, affording 45.5 g (82.8% of theory, 90% of Z isomer according to HPLC analysis) of crude benzofuran-3-one O-methyl-oxime.

Provenance & Evidence