C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 311/58 (2006.01) A01N 43/16 (2006.01) C07C 69/757 (2006.01) C07D 311/74 (2006.01)
Patent
CA 2189514
This invention relates to an improved process for the preparation of 5-methylchroman-6-carboxylic acid, a useful intermediate in the preparation of chroman-containing diacylhydrazines which are useful as insecticides, by reacting a Hagemann's ester with a propargyl derivative in the presence of a base and a solvent to produce a propargyl ether, rearranging the propargyl ether by application of heat with a suitable catalyst being present, with or without a solvent, to produce a cyclic ether type compound and isomerizing the cyclic ether type compound with a catalyst in a suitable solvent to produce a chroman ester. The propargyl ethers and the cyclic ether type compounds produced by the process of the present invention are new.
Dow Agrosciences Llc
Gowling Lafleur Henderson Llp
Hormann Robert Eugene
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