BENZOTHIAZOLONE DERIVATIVE, PRODUCTION THEREOF AND HERBICIDE CONTAINING SAID DERIVATIVE AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound expressed by formula I (R represents lower alkyl, lower alkenyl, lower alkenyl or lower alkoxy-lower alkyl; X represents O or S). EXAMPLE:2-[ 3-( 2-Propenyl )-6-fluoro-2( 3H )-benzothiazolon-5-yl ]tetrahydro-1H- [1,2,4]triazolo[1,2-a]pyridazine-1,3(2H)-dione. USE:A herbicide exhibiting no phytotoxicity problems with rice plant. PREPARATION:A pyridazine derivative expressed by formula II (Y represents lower alkoxyl) {example; ethyl 2-[6-fluoro-3-(2-propenyl)-2(3H)-benzothiazolon-5- ylaminocarbonyl] hexahydropyridazine-1-carboxylate, etc.} is heated preferably at 40-100 deg.C for 0.5-24hr in the presence of a base such as sodium methoxide, etc.