Method for preparing optically active carboxylic acid esters

A method for preparing an optically active carboxylic acid ester of the formula (I): (I) wherein X is a hydrogen atom or a fluorine atom, and * indicates an asymmetric carbon atom, which is an A alpha -isomer having an (S)-configuration on both the acid and alcohol moieties, or rich in said A alpha...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	HAYASHI, MASAHIRO, TAKUMA, KENZI, SUZUKI, YUKIO
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMISTRY FISHING FORESTRY HUMAN NECESSITIES HUNTING METALLURGY ORGANIC CHEMISTRY PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF TRAPPING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A method for preparing an optically active carboxylic acid ester of the formula (I): (I) wherein X is a hydrogen atom or a fluorine atom, and * indicates an asymmetric carbon atom, which is an A alpha -isomer having an (S)-configuration on both the acid and alcohol moieties, or rich in said A alpha -isomer, which method comprises crystallizing said A alpha -isomer from a solution of an A-isomer of the formula (I) having an (S)-configuration on the acid moiety in the presence of a crystal that is of substantially pure A alpha -isomer and in the presence or absence of a basic catalyst.