The mass spectra of 1,5-diarylpent-1-yne-3,5-diones (Ia-e) is studied for the first time. The 3-chloro-4H-pyran-4-ones were obtained from the corresponding acetylenic (beta)-diketones by the action of N-chlorosuccinimide (NCS). The intermediate 4-chloro acetylenic (beta)diketones (7a, d) could be cyclized to the pyrones (9a, d), which gave 3-chloro-1-hydroxy-4-pyridones (13a, d) or isoxazole derivatives (14a, d) with hydroxylamine.
I EL.S EL-KHOLY ,M M MISHRIKEY ,M G MAREI ,
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