Novel esters in the form of their stereoisomers and mixtures of stereoisomers of the formula ##STR1## wherein X is selected from the group consisting of fluorine, chlorine and bromine R.sub.1 is selected from the group consisting of ##STR2## Y.sub.1 and Y.sub.2 may both be methyl and when Y.sub.1 is hydrogen, Y.sub.2 is selected from the group consisting of ##STR3## and Y.sub.3 and Y.sub.4 are individually selected from the group consisting of fluorine, bromine and chlorine or the group consisting of hydrogen and methyl, Z is selected from the group consisting of hydrogen, fluorine, chlorine, bromine, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and when Y.sub.2 is ##STR4## R.sub.2 is selected from the group consisting of ##STR5## A is selected from the group consisting of ##STR6## and when Y.sub.2 is -CHBr-CCl.sub.2 Br, R.sub.2 is m-phenoxy-phenyl and when R.sub.1 is R.sub.1 ' and Y.sub.2 is ##STR7## the said acid moiety may be in the cis or trans form or mixtures thereof or optically active isomeric form or racemic mixtures thereof and when R.sub.1 is R.sub.1 ", the said acid moiety is optically active isomeric form or racemic mixtures thereof and the compounds may be in one of two diastereoisomeric forms due to the existence of the asymetrical carbon atoms to which X is attached having insecticidal activity and their preparation.
式子为##STR1##的立体异构体和立体异构体混合物的新酯,其中X从
氟、
氯和
溴的群组中选择,R.sub.1从##STR2##的群组中选择,Y.sub.1和Y.sub.2均可为甲基,当Y.sub.1为氢时,Y.sub.2从##STR3##的群组中选择,Y.sub.3和Y.sub.4分别从
氟、
溴和
氯的群组或氢和甲基的群组中选择,Z从氢、
氟、
氯、
溴、1到4个碳原子的烷基和1到4个碳原子的烷氧基的群组中选择,当Y.sub.2为##STR4##时,R.sub.2从##STR5##的群组中选择,A从##STR6##的群组中选择,当Y.sub.2为-
CHBr-CCl.sub.2 Br时,R.sub.2为m-苯氧基苯基,当R.sub.1为R.sub.1'且Y.sub.2为##STR7##时,所述酸基团可以为顺式或反式形式或它们的光学活性异构体形式或外消旋混合物形式,当R.sub.1为R.sub.1"时,所述酸基团为光学活性异构体形式或外消旋混合物形式,由于X连接的不对称碳原子的存在,化合物可以处于两种对映异构体形式之一,具有杀虫活性,并且可以制备这些化合物。