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Ring closure reactions O 0130 Interrelation Between the Structure and Cyclization Direction of o-Alkynylbenzenediazonium Salts. -The direction of the cyclization reaction of the intermediate diazonium salts depends on the structure of the starting anilines (I) and (III) leading either to cinnoline (II) or to indazole (IV), respectively. -(ZOL'NIKOVA, N. A.; FEDENOK, L. G.; PERESYPKINA, E. V.; VIROVETS, A. V.; Russ.

Pyridazine derivatives R 0500Improved Method for the Cyclization of ortho-Alkynylbenzenediazonium Salts.-By separating the diazotization and the cyclization step, an improvement in the preparation of cinnolines (II) is achieved. -(ZOLNIKOVA, N. A.; FEDENOK*, L. G.; POLYAKOV, N. E.; Org. Prep. Proced. Int. 38 (2006) 5, 476-480; Inst. Chem. Kinet. Combust., Sib. Branch Russ. Acad. Sci., Novosibirsk 630090, Russia; Eng.) -M. Bohle 03-136