FIRST SYNTHESIS OF HETEROCYCLIC ALLENES – BENZAZECINE DERIVATIVES ArticleVoskressensky L.G., Titov A.A., Dzhankaziev M.S., Borisova T.N., Kobzev M.S., Dorovatovskii P.V., Khrustalev V.N., Aksenov A.V., Varlamov A.V.New Journal of Chemistry. Том Volume 41 Issue 5. 2017.