SUBSTITUTED PYRIDYLUREA DERIVATIVE* ITS PREPARATION AND HERBICIDE CONTAINING THE SAME AS EFFECTIVE COMPONENT

摘要

NEW MATERIAL:N'-Pyridyl-N-methylurea derivatives of formula I (A is H, methyl, methoxy; Y is oxygen or sulfur atom; X is alkylene; n is 0 or 1; R is alkyl, alkoxy, trifluoromethyl, halogen; m is 0-3; where, when A is methoxy, Y is oxygen atom, X is ethylene and, when n is 1, R cannot be methyl in the 4-position from X). EXAMPLE:N'-[ 2-( 3-Trifluoromethylphenoxy )pyridine-5 ]-N-methoxy-N-methylurea. USE:Herbicide: they have high selectivity, show high herbicidal activity against many kinds of weeds and very little injuries to rice plant, wheat and corn. PREPARATION:For example, the reaction of an aminopyridine derivative of formula II with methyl isocyanate or N,N-dimethylcarbamyl chloride affords the compound of formula I.