A process for producing compounds of formula (VIIa) and (VIIb) wherein X is a leaving group; Y and Y
1
are idependently Cl or Br; and Z is Cl, Br or a haloalkyl group which process comprises a) reacting a compound of formula (VII) wherein X, Y, Y
1
and Z are as defined for compounds (VIIa) and (VIIb) with a substantially optically pure chiral amine in a solvent to form a diastereoisomeric salt; b) separating the diastereomeric salt of each enantiomer; c) converting the diastercomeric salt of each anantiomer separately to compounds of formulae (VIIa) and (VIIb) respectively by acid or base hydrolysis, the use of the compounds in making pyrethroid insecticides and novel intermediates.
一种生产化合物的方法,其
化学式为(VIIa)和(VIIb),其中X是一个离去基团;Y和Y1分别是Cl或Br;Z是Cl、Br或卤代烷基,该方法包括:a)将化合物(VII)与定义为化合物(VIIa)和(VIIb)的X、Y、Y1和Z反应,反应溶剂中使用基本光学纯的手性胺形成一个对映异构盐;b)分离每个对映体的对映异构盐;c)通过酸或碱
水解将每个对映异构盐分别转化为化合物的方法(VIIa)和(VIIb),所述化合物用于制造拟
除虫菊酯类杀虫剂和新颖的中间体。