| abstract |
NEW MATERIAL:A condensed pyrazole derivative of formula I [R 1 is H, 1W10C alkyl, allyl, etc.; R 2 is H, substituted carbamoyl of formula II (R 3 is H, 1W5C alkyl, etc.; R 4 is H, 1W5C alkyl, etc.; X is O or S), etc.; A is formula III (R 5 is H, 1W3C alkyl, etc.; R 6 is H or lower alkyl), etc.]. n EXAMPLE: 1H-3,6-Dimethyl-5-cyclohexyl-4,6-dihydro-pyrrolo[4,3-c]pyrazol-4-one. n USE: Useful as a herbicide, germicide, insecticide or intermediate therefor or synthetic intermediate for organic compounds. n PROCESS: A compound of formula V is subjected to the ring closing reaction with hydrazine in a suitable solvent in the presence or absence of a catalytic amount of an acid, e.g. hydrochloric acid, to give a compound of formula I-a, which is then reacted with a compound of the formula R 2 ' Hal (R 2 ' is acyl, etc.; Hal is halogen) in an inert solvent in the presence of a base to afford a compound of formula I-b. n COPYRIGHT: (C)1982,JPO&Japio |