Ethyl formate → HCID 70373861, compound

Participants

Reaction Steps

34.7 g (0.469 mole) of ethyl formate are added dropwise with stirring to 129.4 g (0.469 mole) of 3,3-dimethyl-4-(4-trifluoromethylthiophenyl)-butan-2-one and 25.3 g (0.469 mole) of sodium methylate in 1 liter of diethyl ether at room temperature, and the mixture is stirred at room temperature for 4 hours after the addition is complete. For work-up, the mixture is extracted with 1 liter of water, and the combined aqueous extracts are washed once with diethyl ether, acidified to pH 1-2 with dilute aqueous hydrochloric acid and extracted with dichloromethane. The dichloromethane phase is dried over sodium sulphate and concentrated in vacuo. 90.5 g of 4,4-dimethyl-5-(4-trifluoromethylthiophenyl)-penten-1-ol-3-one are obtained; these are dissolved in 200 ml of methanol and 17.0 g (0.315 mol) of sodium methylate are added. Concentrating the solution in vacuo gives 97.1 g (75% of theory) of the sodium salt of 4,4-dimethyl-5-(4-trifluoromethylthiophenyl)-1 -penten-1-ol-3-one as a resin, which is further reacted without purification. ##STR875##

Provenance & Evidence