UN PROCEDIMIENTO PARA LA PREPARACION DE NUEVOS DERIVADOS DE 4,5-DIHIDRO-2H-PIRIDAZIN-3-ONA.

摘要

Compounds of formula (I): (I) (in which R1 and R3 are hydrogen or halogen: R2 is hydrogen, alkyl, alkoxy or halogen; R4 is hydrogen and R5 is hydroxy or alkoxy; or R4 is hydroxy and R5 is hydrogen; except that R1, R2 and R3 may not all simultaneously be hydrogen) are valuable agricultural fungicides.