Process for the preparation of sulfur ylide intermediates of...

C - Chemistry – Metallurgy – 07 – D

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260/329.4

C07D 333/46 (2006.01)

Patent

CA 1140139

27,8 TITLE AN IMPROVED PROCESS FOR THE PREPARATION OF SULFUR YLIDE INTERMEDIATES OF INSECTICIDAL PYRETHROIDS ABSTRACT The invention is an improved process for the prep- aration of lower alkyl esters of tetrahydrothiophenium car- boxymethylide intermediates of insecticidal pyrethroids, and to insecticidal pyrethroids derived from said ylides.

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