3'-(Trifluoromethyl)acetophenone → (E)-3-(dimethylamino)-1-[3-(trifluoromethyl)phenyl]-2-buten-1-one

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A mixture of 20.0 g of 3-trifluoromethylacetophenone and 20 ml of N,N-dimethylacetamide dimethyl acetal was stirred and heated at reflux for 3 hours. The mixture was evaporated in vacuo to give a red solid. The solid was triturated with n-hexane and filtered. The solid was washed with n-hexane and dried to give 18.0 g of 3-(dimethylamino)-1-[3-(trifluoromethyl)phenyl]-2-buten-1-one as red crystals, mp 71°-73° C.

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