| 摘要 |
NEW MATERIAL:The pyrimidine derivative of formula I [R<1> is (substituted) branched or cyclic alkyl or alkenyl; R<2> is lower alkyl, lower alkenyl or together form cyclic alkylidene or alkenylidene of formula =CR<1>R<2>; R<3>-R<6> are H or lower alkyl or R<4>-R<6> are lower alkenyl, R<5> is halogen, or R<4> and R<5> or R<5> and R<6> together form tri or tetramethylene or butadienylene]. EXAMPLE:4,6-Dimethyl-2-[2-(2,6-dimethyl-4-heptylidene)hydrazino]pyrimi dine. USE:An agricultural fungicide effective for the prevention and remedy of various blights of crops, vegetables and fruit trees such as rice blast, sheath blight, stem rot, helminthosporium leaf spot, bacterial leaf blight, etc. PREPARATION:The compound of formula I can be produced by reacting the compound of formula II with the compound of formula III or reacting the compound of formula IV with the compound of formula V (R<4>'-R<6>' are H, lower alkyl, lower alkenyl, etc.).
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