Methyl vinyl ketone → 5-Nonyn-2-one, 9-chloro-

Participants

Reaction Conditions

Reaction Steps

14.85 Parts of 5-chloropent-1-yne is dissolved in 250 parts by volume of toluene and the resulting solution is cooled to approximately -40° C. To that solution is then added 62.8 parts by volume of 2.31 M ethereal n-butyl lithium and stirring is continued for approximately 15 minutes. 6.87 Parts of boron trifluoride etherate is added and the reaction mixture is stirred for about two hours, then is allowed to stand for about 16 hours at -5° to -10° C. At the end of that time, 10.14 parts of methyl vinyl ketone is added at -40° C. and the reaction mixture is stirred for about 4 hours, then is quenched with water. 50 Parts by volume of 3 N hydrochloric acid is added and the mixture is kept at room temperature for about 16 hours, at the end of which time the aqueous and organic layers and separated. The aqueous layer is extracted with toluene and the organic layer with water. The organic solutions are combined, washed successively with aqueous sodium hydroxide and water, then dried over anhydrous sodium sulfate and stripped to dryness under reduced pressure to afford the crude product. This material is purified by distillation under reduced pressure to give 9-chloro-5-nonyn-2-one, boiling at about 80° - 92° C. at a pressure of 0.11 - 0.06 mm.

Provenance & Evidence