Process for the preparation of enantiomerically pure...

Details Process for the preparation of enantiomerically pure... Process for the preparation of enantiomerically pure...

2005-04-05

2005-04-05

Desai, Rita (Department: 1625)

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

Organic compounds

Carboxylic acid esters

C562S460000, C510S302000, C252S175000

Reexamination Certificate

active

06875885

ABSTRACT:
A process for producing compounds of formula (VIIa) and (VIIb) wherein X is a leaving group; Y and Y1are idependently Cl or Br; and Z is Cl, Br or a haloalkyl group which process comprises a) reacting a compound of formula (VII) wherein X, Y, Y1and Z are as defined for compounds (VIIa) and (VIIb) with a substantially optically pure chiral amine in a solvent to form a diastereoisomeric salt; b) separating the diastereomeric salt of each enantiomer; c) converting the diastereomeric salt of each anantiomer separately to compounds of formulae (VIIa) and (VIIb) respectively by acid or base hydrolysis, the use of the compounds in making pyrethroid insecticides and novel intermediates.

REFERENCES:
patent: 4166064 (1979-08-01), Kondo et al.
patent: 4335252 (1982-06-01), Engel
patent: 4429149 (1984-01-01), Engel

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