| Abstract: | An improved synthesis of cyclohexanothioxanthenones in high yield (70-90%) by treatment of thiosalicylic acid ( 4 ) or 2,2′-dithiosalicylic acid with 1,2,3,4-tetrahydronaphthalene ( 5 ) in the presence of concentrated sulfuric acid or a mixture of 95% sulfuric acid with 27-30% fuming sulfuric acid (in 5:1 to 2:1 v/v ratio) was described. The crude product consisted of three isomers which were isolated and identified. These isomers are 1,2-, 2,3- and 3,4-cyclohexanothioxantenone ( 1, 2 , and 3 ). |
