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13.3 g of 3,4-dihydro-3,3-dimethyl-2H-1,5-benzodithiepine were dissolved in 110 ml of ethylene chloride under argon and treated portionwise at -10° C. in succession with 10.1 ml of acetyl chloride and 19 g of aluminum chloride. Thereafter, the reaction mixture was stirred at room temperature for 21/2 hours, poured on to ice and extracted with ether. The extract was washed with dilute sodium hydroxide solution and water, dried and evaporated to dryness. There were obtained 15.5 g of 3,4-dihydro-3,3-dimethyl-2H-1,5-benzodithiepin-7-yl methyl ketone in the form of brownish crystals.

1. additionpoured on to ice
2. extractionextracted with ether
3. washThe extract was washed with dilute sodium hydroxide solution and water
4. customdried
5. customevaporated to dryness