FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to the improved method of synthesis of 4-hydroxy-9H-carbazole by dehydrogenation of 1,2,3,4-tetrahydro-4-oxocarbazole in an aqueous alkali solution in the presence of catalyst. Palladium on carbon is used as catalyst and dehydrogenation reaction is carried out at temperature about 100 C. Method provides the yield >88%, high product purity and possibility of repeated catalyst using. EFFECT: improved method of synthesis, increased yield.
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