Process for the preparation of optically active 2-[4-(2',4'-diha

Details Process for the preparation of optically active 2-[4-(2',4'-diha Process for the preparation of optically active 2-[4-(2',4'-diha

1986-12-22

1988-07-12

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

560 61, 560 62, 562472, C07B 5700

Patent

active

047571551

ABSTRACT:
A process for the preparation of optically active 2-[4-(2',4'-dihalophenoxy)phenoxy]propionic acids of at least 75 percent enantiomeric excess of the desired optical isomer which comprises contacting a 2-chloropropionic acid or a lower alkyl ester or an alkali metal salt thereof, having an optical purity of greater than 90 percent of the opposite configuration, with from 2 to 10 molar equivalents of a 4-(2',4'-dihalphenoxy)phenol in an aqueous base.

REFERENCES:
patent: 4035416 (1977-07-01), Brust
patent: 4173709 (1979-11-01), Metivier et al.
patent: 4309547 (1982-01-01), Koch et al.
patent: 4532346 (1985-07-01), Rehn et al.

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