Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1981-10-15
1984-07-03
Shippen, Michael L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
548479, 548517, 548527, 548547, 548551, 548556, 548562, 549 60, 549 66, 549324, 549473, 549479, 549496, 549499, 549 77, 549 79, 260465D, 560118, 560211, 560217, 560219, 562500, 562506, C07C 69743
Patent
active
044580908
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.
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Fumio Mori
Kazuo Itoi
Takashi Nishida
Yoshiaki Omura
Kuraray Co. Ltd.
Shippen Michael L.
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