| abstract |
Thiadiazine compounds of the formula (I) (FORMULA) wherein R1 is alkyl, R2 is alkyl, cycloalkyl, alkenyl or aryl, R3 is alkyl and R4 is alkyl, are useful as insecticides. The thiadiazine compounds are prepared by the addition of a dialkylhalothiophosphate to a tetrahydro-6H-1,3,4-thiadiazin-5-one. The thiodiazin-5-one precursor is prepared by reacting a thiosemicarbizide with an alkyl alpha-halothio acetate or with a haloacetic anhydride. |