To obtain the subject new compound useful as agrochemicals for controlling damages to agricultural or horticultural crops by diseases.
This compound is shown by formula I (R1 and R2 are each H, a 1-8C alkyl or the like; X1 and X2 are each O or S; Y1 and Y2 are each O, S or the like; and R is a 0-30C alkylene), e.g. bis(4-methyl-1,2,3-thiadiazole-5- carboxylic acid)ethylene. The objective compound is obtained by hydrolyzing and then halogenating a product from the reaction between compounds shown by formulas II and III (R' is a 1-8C alkyl; and R'' is a 1-4C alkyl or the like), after cyclizing the product with thionyl chloride, to produce a compound shown by formula IV (Hal is a halogen), and then by reacting it with a compound shown by formula V in the presence of a base in an inert solvent. The objective compound shows a very high controlling effect against crop diseases, including bacterial diseases, e.g. rice blast, wheat powdery mildew, grape downy mildew and cabbage slimy soft rot, and viral diseases, e.g. tobacco mosaic.
SHIMAOKA TAKASHI
TAKAGI KAZUHIRO
BABA KOJI
TAJIMA SOKICHI
