| 摘要 |
Products of formula (I), wherein each of R1, R2 and R3, which are the same or different, is an alkenyl, alkynyl or straight, branched or cyclic alkyl radical containing up to 8 carbon atoms and being optionally substituted by one or more halogen atoms, an aryl radical optionally substituted by one or more halogen atoms, one or more hydroxyl radicals, one or more straight or branched alkyl radicals optionally substituted by one or more halogen atoms, or one or more O-alkyl or S-alkyl radicals optionally substituted by one or more halogen atoms; X is a hydrogen atom, a halogen atom, an alkyl, alkenyl, alkynyl, O-alkyl, O-alkenyl, O-alkynyl, S-alkyl, S-alkenyl or S-alkynyl radical, optionally substituted by one or more halogen atoms and containing up to 11 carbon atoms, an aryl radical containing up to 14 carbon atoms, or a radical CN, NO2, NH2, (a), CO2alc3, alc1, alc2 or alc3, which are the same or different and are an alkyl radical containing up to 8 carbon atoms; and R4 is as defined above for X, except for hydrogen.
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