Abstract
Reactions of 3-aminothiocarbonylphthalazine-1,4-dione (2) with aromatic aldehydes, benzoyl chloride, benzoin and omega-bromomethylaryl ketones yielded the corresponding 3-(substituted amino)thiocarbonylphthalazine-1,4-diones (3, 8, and 9) and 4-aryl-1-thioxo-1,2,4-triazino[1,2-b] phthalazine-5,10-diones (7). Acylation of 3b with acetic anhydride gave the corresponding diacetyl derivative (4). The electron impact mass spectra of both the above series of compounds have also been recorded and their fragmentation pattern is discussed.