1,2,4-DITHIAZOLIDINE-3,5-DIONES, THEIR PREPARATIONS, AND FUNGICIDE COMPRISING THEM AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound shown by the formulaI[R is alkyl, cycloalkyl, or a group shown by the formula II(X and Y are H, lower alkyl, lower alkoxyl, cyano, etc.)]. EXAMPLE:0,0-Diphenyl 1-(3,5-dioxo-1,2,4-dithazolidine-4-yl)ethane phosphate. USE:A controller for plant blight. Showing excellent effect on blast and helminthosporium leaf spot of rice plant, downy mildew of vegetables, and black spot of fruit, having extremely low toxicity to men and beasts, fishes, and environmental small animals. PROCESS:A thionocarbamate shown by the formula III is reacted with a chlorocarbonylsulfenyl chloride shown by the formula IV to give a compound shown by the formulaI. The reaction is carried out in an inert solvent (e.g., n-hexane) in the presence or absence of a dehydrochlorinating agent (e.g., TEA) at 0-30 deg.C for 5min-several hours. The compound shown by the formula III is obtained by reacting an aldehyde shown by the formula V with compound shown by the formula VI and triphenyl phosphite.