Friedel-Crafts reaction of 6H, llH-dibenzo [b, e] thiepin (I) with acetyl chloride gives rise to the monoacetyl derivative II. Analogously, the 2-propionyl deriv~ tive III is formed. Willgerodt's reaction of these ketones was studied and thioamides V and VI and acids VII and VIII were obtained. Beckmann's rearrangement of oxime IX gave rise to the 2-acetamido derivative X. Oxidation of ketone II and acid VII yielded the sulfoxides XIII and XIV and further the ...