In addition to the rich chemistry of the Beirut reaction, Professor Haddadin did original work in the areas of Isobenzofuran, Isoindoles, tetrazines, quinolines, furans, pyrroles, cinnolines and indazoles.
2.
A classic organic reaction for synthesizing cinnolines is the "'Widman Stoermer synthesis "', a ring-closing reaction of an ?-vinyl-aniline with hydrochloric acid and sodium nitrite:
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