Hydrochloric Acid → 1,1'-(4,5-Dihydronaphtho[1,2-b]thiene-2,7-diyl)di(ethan-1-one)

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Reaction Steps

To a solution of 1-(4,5-dihydronaphtho[1,2-b]thiophen-2-yl)ethanone (5b) (30 g, 131 mmol) in 500 mL of DCM at 0° C., AlCl3 (52.6 g, 394 mmol) was added portion wise and after 15 min, acetyl chloride (18.69 ml, 263 mmol) was added dropwise at the same temperature over 30 min and the mixture was stirred at room temperature for 48 hr. The reaction mass was slowly added to ice water and acidified with 2 N HCl solution and extracted with DCM, and the organic layer was dried over anhydrous sodium sulphate and concentrated under reduced pressure to afford the title compound as an yellow solid (5c) (28.3 g, 80%). m/z 270.0 (M+).

Provenance & Evidence