| abstract |
NEW MATERIAL: Dione compounds of formula I [R 1 -R 4 are unsaturated aliphatic hydrocarbon residue, cycloalkyl, Ar, (A 1 )nX (Ar is 5-6 membered heteroaryl; n is 0 or 1; X is H, NO 2 , halogen, CN, benzyl, etc.; A 1 is methylene or ethylene); A 2 is bond, O, S, CO, etc.; A 3 -A 4 are each C=C(OR a ) or C(X 1 )-C(O) (R a is H or salt forming part, OR a is ester part, etc.; X 1 is F or Cl); Y is pghenyl, heteroaromatic group]. n EXAMPLE: 2-(1-Methyl-4-nitro-5-pyrazolylcarbonyl)-1,3-cyclohexanedione. n USE: Herbicide. n PROCESS: A compound of formula II is reacted with a compound of a formula Y-CO-Hal (Hal is halogen), and a compound of formula IV is obtained by the rearrangement of a resultant compound of formula III. n COPYRIGHT: (C)1990,JPO |