N-Methyl-N-alkylthio-N'-phenyl ureas - with selective herbicidal activity in cereals, and some in beet crops

摘要

Herbicidal ureas, disclosed in the parent patent, are of formula (I) (where R1 and R2 are each H, Cl, Br, NO2, CF3, 1-6C alkyl, 1-6C alkoxy; n is 0 or 1; X is alkyl opt. substd by halogen or a nitrogen-contg. heterocycle opt. contg. >=1 other heteroatom; Y is H, 1-4C alkyl or S-Z; Z is a nitrogen-contg. heterocycle opt. contg. >=1 other heteroatom; the arrows from S to the O indicate that the grouping is either a sulphoxide or sulphone). The patent of addn. claims specif. N-mthyl N-isopropyl thio N'-phenyl urea, N-(2-chloroethyl thio (N'-(3,4-dichloro phenyl) urea, N-methyl N-n-butyl thio N'-(4-isopropyl phenyl) urea, N-methyl N-isopropyl thio N'-(3,4-dimethyl phenyl) urea and N-methyl, N-n-butyl thio N'-(3,4-dimethyl phenyl) urea.