Propargyl Ethers

Details Propargyl Ethers Propargyl Ethers

1997-07-09

1998-05-26

Richter, Johann

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

Organic compounds

Carboxylic acid esters

C07C 6975, C07C 69757

Patent

active

057568200

ABSTRACT:
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.

REFERENCES:
Gesson, J.P., CA 99:158094, 1983.

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