【発明の名称】α―シアノ―3―フエノキシ―4―フルオロ―ベンジルパーメトレートのある種の光学的対掌体の対の調製方法

Title:

【発明の名称】α―シアノ―3―フエノキシ―4―フルオロ―ベンジルパーメトレートのある種の光学的対掌体の対の調製方法

Document Type and Number:

Japanese Patent JPH0788345

Kind Code:

B2

Abstract:

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.

Inventors:

Liner Foots
Klaus Naumann

Application Number:

JP345085A

Publication Date:

September 27, 1995

Filing Date:

January 14, 1985

Export Citation:

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Assignee:

Bayer Actien Gezershyaft

International Classes:

A01N53/08; C07B31/00; C07B57/00; C07C67/00; C07C253/00; C07C253/34; C07C255/38; C07C255/39; C07C255/53; A01N53/00; (IPC1-7): C07C255/39; C07C253/34

Domestic Patent References:

JP56166164A
JP56166163A

Attorney, Agent or Firm:

Heiyoshi Odashima

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