PYRAZOLYLOXYPICOLINAMIDE DERIVATIVES, PROCESS OF THEIR PREPARATION, INTERMEDIATES USED IN THIS PREPARATION PROCESS, HERBICIDAL COMPOSITION CONTAINING SUCH PYRAZOLYLOXYPICOLINAMIDE DERIVATIVES AND HERBICIDAL APPLICATION THEREOF

摘要

New herbicidal picolinamide derivatives having the general formula I wherein Z represents an oxygen or sulfur atom, R 1 is n. and R.sup.2.n. each independently represents a hydrogen atom or an optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl, hydroxy, alkoxy, alkenyloxy, alkynyloxy, alkylcarbonyl, amino, mono- or dialkylamino, arylalkylamino or dialkylcarbamoyl group or together represent an alkylene chain, which is optionally interrupted by an oxygen or sulfur atom or an -NR- group in which R is a hydrogen atom or an alkyl group, R 3 or 3 or 3, R 3. independently represent a halogen atom or an alkyl, alkoxy, alkylthio, dialkylamino or haloalkyl group; and R.sup.5.n. each independently represents a hydrogen atom or a halogen atom, an optionally substituted alkyl, alkenyl, alkynyl or alkaryl group, an alkoxy group, an amino group, a mono- or t