Cis-lactone pyrethroid intermediates

Details Cis-lactone pyrethroid intermediates Cis-lactone pyrethroid intermediates

1980-10-23

1981-10-13

Ford, John M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30793

Patent

active

042947650

ABSTRACT:
Isolation of cis acids of the formula ##STR1## wherein each of the groups X.sup.1 and X.sup.2 represents a fluorine, chlorine or bromine atom or a hydrocarbyl group, from a mixture of cis and trans acids of this formula, by idolactonization, forming novel cis-lactones of the formula ##STR2## isolation of these cis-lactones and reduction thereof to the said cis acids.
The process may be used for the isolation of cis precursors to insecticides from mixtures with their trans isomers.

REFERENCES:
patent: 4166063 (1979-08-01), Martel et al.
patent: 4219562 (1980-08-01), Roman
Methoden der Organischen Chemie (Houben-Wehyl), V1/2, p. 611 (1963).
Staninets, V. I. et al., Russian Chemical Reviews, 40(3), pp. 272-283 (1971).

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