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procedure for the manufacture of two enantiomerpar out from the mixture of all 8 stereoisomer of the r / s whereas 3 phenoxy 4-fluorobenzyl 3r / s - (2,2-dichlorovinyl) - 22 - dimethyl - 1r / s cyclopropancarboxylsyrester
procedure for the manufacture of two enantiomerpar out from the mixture of all 8 stereoisomer of the r / s whereas 3 phenoxy 4-fluorobenzyl 3r / s - (2,2-dichlorovinyl) - 22 - dimethyl - 1r / s cyclopropancarboxylsyrester
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机译:从r s的所有8种立体异构体的混合物中制备两种对映异构体的方法,而3种苯氧基4-氟苄基3r s s-(2,2-二氯乙烯基)-22-二甲基-1r s s环丙羧基酯
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摘要
A process for the preparation of the enantiomeric pairs (1R-3R- alpha S+1S-3S- alpha R) and (1R-3S- alpha S+1S-3R- alpha R) from a mixture of all 8 stereoisomers of the compound alpha R/S-cyano-3-phenoxy-4-fluorobenzyl 3R/S-(2,2-dichlorovinyl)-2,2-dimethyl-1R/S-cyclopropanecarboxylate, comprising dissolving the mixture in a secondary or tertiary alkylamine having 2-6 C atoms per alkyl radical, subjecting the solution to crystallization whereby the enantiomeric pairs (1R-3R- alpha S+1S-3S- alpha R) and (1R-3S- alpha S+1S-3R- alpha R) crystallize out from the solution, and separating the crystallized material. The crystals are enriched in the most active components.
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