Method of producing gamma-halogeno-delta unsaturated carboxylic

Details Method of producing gamma-halogeno-delta unsaturated carboxylic Method of producing gamma-halogeno-delta unsaturated carboxylic

1982-02-22

1984-08-28

Shippen, Michael L.

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

Organic compounds

Carboxylic acid esters

260465D, 548477, 548478, 548513, 548517, 548527, 548547, 548562, 549 60, 549 66, 549 77, 549 79, 549478, 549491, 549499, 560217, 560219, C07C 69743

Patent

active

044685211

ABSTRACT:
Novel .gamma.-lactone derivatives are provided. These lactone derivatives, when reacted with hydrogen halide in alcohol, yield .gamma.-halogeno-.delta.-unsaturated carboxylic acid esters. This ring-opening process is useful for the purpose of increasing the yield of pyrethrin analogs which are of value as insecticides and agricultural chemicals. Thus, the .gamma.-lactone derivatives by-produced in the production process for dihalogenovinyl chrysanthemumates are caused to undergo ring-opening reaction to yield the corresponding .gamma.-halogeno-.delta.-unsaturated carboxylic acid esters which are important intermediates for said pyrethrin analogs.

REFERENCES:
patent: 3077496 (1963-02-01), Julia
patent: 3123629 (1964-03-01), Julia
patent: 3354196 (1967-11-01), Julia
patent: 3652652 (1972-03-01), Julia
patent: 4083855 (1978-04-01), Itaya

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