TETRAHYDROISOPHTHALIMIDE DERIVATIVE, ITS PREPARATION, AND HERBICIDE CONTAINING IT AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound shown by the formulaI(R1 and R2 are H or halogen; R3 is H or lower alkyl; R4 is halogen- or lower alkoxy-containing alkyl). EXAMPLE:N-(3-Methoxycarbonylphenyl)-DELTA<1>-tetrahydroisophthalimide. USE:A herbicide, showing high herbicidal effect on annual or perennial weeds in a paddy field, exhibiting also improved herbicidal effect by treatment before germination or treatment in growth period. Having low phytotoxicity to crops. PROCESS:A compound shown by the formula II is reacted with a dehydrating and condensation agent in the presence of an inert solvent at 0-50 deg.C to give a compound shown by the formulaI. A carbodiimide derivative, or a combination of a base and an acid halogenating agent or an acylating agent is used as the dehydrating and condensation agent.