PYRIMIDINE DERIVATIVES HAVING HERBICIDAL ACTIVITY, PROCESS FOR CONTROLLING UNDESIRABLE VEGETATION Russian patent published in 1994 - IPC

FIELD: agriculture. SUBSTANCE: the product: pyrimidine derivatives of the formula 1: wherein R₁ is C₁-C₄-alkyl; O is C₁-C₄-alkyl, halogen; R₂ is C₁-C₄-alkyl, O is C₁-C₄-alkyl; n is 3-5; Z is C(O)OH, C(O)O-C₁-C₄-alkyl, C(O)=NH=S(O)₂(O)-phenyl. Reagent 1: a compound of the formula II: wherein L is a leaving group. Reagent 2: a compound of the formula III: . Reaction conditions: in an inert organic solvent. The process for controlling undesirable vegetation is carried out by treatment with said pyrimidine derivatives used in an amount of 1 to 10 mg/ha. EFFECT: improved properties of the pyrimidine derivatives. 3 cl, 2 tbl