| 摘要 |
Compounds of formula : …<CHEM>… wherein R1 is optionally substituted alkyl, alkenyl, alkyyl, cycloalkyl, cycloalkenyl of up to 8 carbon atoms or is optionally substituted aryl, aralkyl or heterocyclyl; R2 is an optionally substituted alkyl, alkenyl, alkynyl, alkynylalkenyl, alkenylalkynyl, cycloalkyl, cycloalkenyl or cycloalkylalkyl group of up to 8 carbon atoms; R<3> and R<4>, which can be the same or are different, are hydrogen, but are not both hydrogen, or are alkyl of up to 4 carbon atoms, alkoxy, OCF3, CF3 or halogen or together constitute a ring of 3-6 atoms; Y is -CH= or =N- ; and esters, ethers, salts and metal complexes thereof; are plant growth regulators. |
