Hydrochloric Acid → 6-(2-Chloroethyl)-1,3,3-trimethylbicyclo[2.2.2]octan-2-one

Participants

Reaction Conditions

Reaction Steps

To a 100 ml microflask equipped with thermometer, reflux condenser, dropping funnel and magnetic stirrer is charged 12.3 g of 1,3,3-trimethyl-6-(2-hydroxyethyl)bicyclo(2.2.2)-octan-2-one prepared according to the process of Example XVII, and 20 ml benzene. The dropping funnel is charged with 12 g thionyl chloride. The thionyl chloride is added to the reaction mass from the dropping funnel, slowly, over a period of five minutes as the temperature of the reaction mass rises to 35° C. The reaction mass is then refluxed for a period of 10 hours at 90° C. The flask is then vented to the atmosphere and heated on a steam bath in order to volatilize the unreacted thionyl chloride and any hydrogen chloride reaction product remaining. The reaction mass is then cooled and hydrolyzed with 50 g ice. The organic layer is separated, and the aqueous phase is extracted with four 20 ml portions of anhydrous diethyl ether. The organic layers are bulked and washed with (i) three 20 ml portions of saturated sodium bicarbonate solution and (ii) one 20 ml portion of water. The organic phase is then dried over anhydrous magnesium sulfate and stripped of the diethyl ether. The reaction product is then distilled at 105°-115° C. at a pressure of 0.2 mm Hg. Its structure, confirmed by NMR and mass spectral analyses is as follows: ##STR37##

Provenance & Evidence