All stereoisomeric forms and mixtures of stereoisomers of compounds of the formula ##STR1## wherein X is selected from the group consisting of oxygen, sulfur, sulfoxide and sulfone, R.sub.1 and R.sub.3 are individually selected from the group consisting of optionally unsaturated alkyl of 1 to 7 carbon atoms and optionally unsaturated cycloalkyl of 3 to 7 carbon atoms optionally substituted with at least one halogen and optionally interrupted with at least one heteroatom and aryl and aralkyl of 6 to 18 carbon atoms and R.sub.2 is the residue of a R.sub.2 OH alcohol used in pyrethrinoids synthesis having pesticidal activity and their preparation and novel intermediates.
公式为##STR1##的化合物的所有立体异构体和立体异构体混合物,其中X选自氧、
硫、亚砜和砜的群体,R.sub.1和R.sub.3分别选自1至7个碳原子的可选不饱和烷基和3至7个碳原子的可选不饱和环烷基,可选地含有至少一个卤素和可选地中断至少一个杂原子和6至18个碳原子的芳香基和芳基烷基,R.sub.2是在拟
除虫菊酯合成中使用具有杀虫活性的R.sub.2 OH醇的残基,以及它们的制备和新型中间体。