Abstract Diazotization of vicinal 1-amino-2-ethynyl-4-R-9, 10-anthraquinones followed by a reaction with NaN 3 gave 5-hydroxy-3-R-1 H-naphtho [2, 3-g] indazole-6, 11-diones or 3- ethynyl-5-R-6 H-anthra [1, 9-cd] isoxazol-6-ones, depending on the substituents at the triply