Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1983-04-25
1985-03-19
Trousof, Natalie
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
560 55, 562465, C07B 2000
Patent
active
045060975
ABSTRACT:
A method for the racemization and hydrolysis of alkyl esters of (-)-2-(4-difluoromethoxyphenyl)-3-methylbutyric acid, followed by the resolution of said resulting racemic acid into its optically active components via salts prepared from the same with optically active amines and recovery of the dextrorotatory (+) isomer therefrom. The present invention also relates to insecticidal pyrethroids prepared from (+)-2-(4-difluoromethoxyphenyl)-3-methylbutyric acid.
REFERENCES:
patent: 4199595 (1980-04-01), Berkelhammer et al.
patent: 4237313 (1980-12-01), Higo et al.
patent: 4245116 (1981-01-01), Ohno et al.
American Cyanamid Co.
Clarke Vera C.
Noe Alphonse R.
Trousof Natalie
Tsevdos Estelle J.
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