Abstract Reaction of 3-(o-ehlorobenzylidene)-2, 4-dioxopentanoic acid (1) with hydroxylamine hydro-chloride in acetic acid gave 5-(o-chlorophenyl)-3-methyl-4-(α- hydroxyimino) isoxazolineglyo-xylic acid (5) and 3-(o-chlorobenzylidene)-4-hydroxyimino-2- oxopentanoic acid (2) in 57% and 7% yields. Pyrolysis of 5 afforded 5-(o-chlorophenyl)-3- methylisoxazole-4-carbonitrile (8), cis-and trans-5-(o-chlorophenyl)-3-methylisoxazoline-4 ...
![3-[(2-chlorophenyl)methylidene]-2,4-dioxopentanoic acid Structure](https://image.chemsrc.com/caspic/296/61253-64-3.png)
![[5-(2-chloro-phenyl)-3-methyl-4,5-dihydro-isoxazol-4-yl]-hydroxyimino-acetic acid Structure](https://image.chemsrc.com/caspic/357/62219-85-6.png)