NEW MATERIAL:A compound expressed by formula I [R1 represents H, lower alkyl, haloalkyl or phenyl; R2 represents H, lower alkyl (alkyl may be substituted with halogen, etc.), cycloalkyl, alkenyl, alkylcarbonyl, dialkylcarbamoyl, etc.].
EXAMPLE: 3'-Methoxy-4-oxo-5-formyl-4,5-dihydro-1,2-dithiolo-[4,3-b]pyrrole.
USE: An agricultural and horticultural controlling against diseases and insect pests.
PREPARATION: A compound expressed by formula II is reacted with a carboxylic anhydride expressed by formula III (R1 represents lower alkyl, haloalkyl or phenyl) to form a compound expressed by formula IV, which is then reacted with a mixture of formic acid with a lower alkyl carboxylic anhy dride to afford the compound expressed by formula I wherein group R1 represents H.
KOBAYASHI MASUKO
TANAKA TOMOAKI
YOSHIDA HIROSHI
NAKAGAWA TAIZO
KUROKAWA TAKASHI
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