Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1986-02-05
1988-04-26
Shippen, Michael L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560174, 560192, 562506, 568303, 568348, 568393, C07C 69743
Patent
active
047406127
ABSTRACT:
A novel process for producing a .beta.-dihalogenoethenylcyclopropane derivative of the formula, ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group, R.sub.3 is a hydrogen atom, lower alkyl, acyl, carboxyl or alkoxycarbonyl group and R is a hydrogen atom or a lower alkyl group and each of Y.sub.1 and Y.sub.2 is a fluorine, chlorine or bromine atom respectively, which is an acidic moiety of the useful synthetic insecticides of the pyrethrin type, which process comprises a combination of a series of sequential steps starting from alkyl 3-butenyl ketone derivative of the formula (I), which may be shown according to the following reaction scheme: ##STR2## According to this process, objective compound of the formula (VI) having any cis/trans ratio can be produced by selecting the reaction condition of the Stages II-1, II-2, and IV-2.
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Itaya Nobushige
Magara Osamu
Matsuo Takashi
Shippen Michael L.
Sumitomo Chemical Company Limited
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