| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R presents ethyl, isopropyl or cyclopropyl). EXAMPLE:5-Hydroxy-2-isopropyl-2,6,7-trimethyl-4H-1, 4-diazabicycl-o[3.3.0]oct-6- ene-3,8-dione. USE:A herbicide. PREPARATION:A dioxopyrroline derivative expressed by formula II (example; alpha-isopropyl-alpha-methyl-2,5-dioxo-3,4-dimethyl-3-pyrroline-1-acet amide, etc.) is reacted with a base (example; NaOH, etc.).
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