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The isomerization of 9-propargylcarbazole in alcoholic alkali leads to the product of dimerization of 9-allenylcarbazole, 1,2-bis(9-carbazolylmethylene)cyclobutane, the structure of which was established by X-ray diffraction analysis.We have synthesized 9-propargylcarbazole 1 with the aim of studying its properties and application in synthesis of acetylene derivatives of carbazole. This was achieved by the action of propargyl bromide on carbazolylsodium, prepared in 80% yield by heating metallic sodium and carbazole in dioxane. This compound was obtained previously by the action of propargyl bromide on the sodium derivative of carbazole in liquid ammonia [1,2], in DMF [3], or in acetonitrile [4]. The patented procedure [5] differed in the use of potassium derivative of carbazole. __________________________________________________________________________________________

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