| 摘要 |
NEW MATERIAL:The compound of formula I [R1 and R8 are same or different H, 1-11C alkyl, lower alkenyl, lower alkynyl, cycloalkyl, lower alkoxyalkyl, phenyl, aralkyl which may have 1-2 substituent halogen atoms or lower alkoxy groups on the nucleus, etc.; R2-R6 are H, halogen, cyano, nitro, amino, lower alkyl, halogenated lower alkyl, hydroxyl, lower alkoxy, aryloxy, carboxy, etc.; R7 is H, halogen, lower alkyl, etc.; R7 and R8 may together form -(CH2)m-; m is 3 or 4]. EXAMPLE:2-Butyl-N-(2, 6-diethylphenyl)-6-methyl-4-thioxo-4H-pyran-3-carboxami de. USE:A plant growth suppressing agent. PREPARATION:The compound of formula I can be produced by reacting a compound of formula II with a sulfurizing agent in an inert solvent.
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