Abstract
Abstract The Schmidt reaction with 2,3-diphenylindone, in a mixture of sulphuric and acetic acid, affords 3,4-diphenylcarbostyril (A1), 3,4-diphenylisocarbostyril (A2), 5-phenyl-11H-indolo[3.2-c]-isoquinoline (B1) and 3-(o-aminophenyl)4-phenylisocarbostyril (B2). The probable mechanism of formation of the four products is discussed. The same reaction, if carried out in sulphuric acid, gives 3-(p-sulphophenyl)4-phenylcarbostyril as the only reaction product. The Schmidt reaction with 3-methyl-2-phenylindone and 3-ethyl-2-phenylindone is also described.
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