A compound having the structural formula ##STR1## wherein R is selected from the group consisting of C.sub.1 -C.sub.5 alkyl, preferably methyl; C.sub.1 -C.sub.3 haloalkyl, preferably C.sub.2 -haloalkyl and most preferably trifluoromethyl; aryl, preferably phenyl, C.sub.2 -C.sub.8 alkoxyalkyl, preferably ethoxyethyl and ethoxyethoxyethyl; R' is selected from the group consisting of C.sub.2 -C.sub.8 alkyl, preferably C.sub.2 -C.sub.3 alkyl; C.sub.1 -C.sub.3 alkoxy, preferably methoxy; cyclopropyl; methacryl; C.sub.1 -C.sub.3 alkylmercapto, preferably methylmercapto; methylamino; ethylamino; C.sub.2 -C.sub.4 dialkylamino, preferably dimethylamino; C.sub.2 -C.sub.4 alkylalkoxyamino, preferably methylmethoxyamino; and n equals the integer 0 or 1.
一种具有结构式##STR1##的化合物,其中R选自C.sub.1 -C.sub.5烷基,优选甲基;C.sub.1 -C.sub.3卤代烷基,优选C.sub.2 -卤代烷基,最优选三
氟甲基;芳基,优选苯基,C.sub.2 -C.sub.8烷氧基烷基,优选乙氧基乙基和乙氧基氧基乙基;R'选自C.sub.2 -C.sub.8烷基,优选C.sub.2 -C.sub.3烷基;C.sub.1 -C.sub.3烷氧基,优选甲氧基;环丙基;甲基
丙烯酰基;C.sub.1 -C.sub.3烷基
硫醇基,优选甲基
硫醇基;
甲胺基;
乙胺基;C.sub.2 -C.sub.4二烷基胺基,优选
二甲胺基;C.sub.2 -C.sub.4烷基氧基胺基,优选甲基
甲氧基胺基;n为整数0或1。