Studies on Acetylenic Compounds. XXVI. Ring Closure.(6). New Synthetic Method of Heterocyclic Compounds from α-Substituted Acetylenic Compounds

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Treatment of α-thiocyanatoacetylenic campaunds with concentrated sulfuric acid gave 2-thiazolol derivatives. 2-Phenyloxazole was also obtained in good yield by cyclization of 2-propynyl benziminoether by a similar procedure.