| 摘要 |
A compound having the general formula: <IMAGE> and stereoisomers thereof, wherein R1 is alkyl, alkenyl, alkynyl, cycloalkyl or cycloalkenyl, all having up to 8 carbon atoms; or is aryl, aralkyl or heterocyclyl, any of which may be optionally substituted; R2 is alkyl, alkenyl, alkynyl, alkynylalkenyl, alkenyl alkynyl, cycloalkyl, cycloalkenyl, or cycloalkylalkyl, all of which contain up to 8 carbon atoms and may be substituted; R3 and R4, which can be the same or different, are hydrogen (but are not both hydrogen) or are alkyl of up to 4 carbon atoms, alkoxy of up to 4 carbon atoms, OCF3, CF3 or halogen, or together constitute a ring of 3-6 carbon atoms; and Y is =CH- or =N-; and esters, ethers, salts and metal complexes thereof. The compounds are useful as plant growth regulating agents.
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