Dibenzothiophene → 1-(Dibenzo[b,d]thiophen-2-yl)ethan-1-one

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Reaction Steps

Dibenzothiophene (18.4 g.) and anhydrous aluminium chloride (13.3 g.) were mechanically stirred in carbon disulphide (100 ml.) while acetyl chloride (7.85 g.) in carbon disulphide (20 ml.) was added dropwise over 0.5 hr. The temperature of the mixture rose to 30° C. After a total of 4 hr. stirring the mixture was poured on to ice and extracted with chloroform. The extract was washed with sodium bicarbonate solution, dried with magnesium sulphate, and evaporated. The residue was distilled under vacuum and a fraction, b.pt. 160°-180° C. at 0.6 mm. Hg, was extracted by boiling with ether, and the residue recrystallised twice from methanol to give colourless crystals of 2-acetyldibenzothiophene m.pt. 97°-100° C.

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