Process for the preparation of diphenyl ethers

Details Process for the preparation of diphenyl ethers Process for the preparation of diphenyl ethers

C - Chemistry, Metallurgy

07

C

260/591.1, 260/6

C07C 205/38 (2006.01) C07C 201/12 (2006.01)

Patent

CA 1264763

ABSTRACT An improved process for the preparation of herbicidal diphenyl ethers of the generic formula I Image (I) in which R1, R2, X1,and X2 have a range of possible meanings. The described process reacts a compound of formula IV with a phenol of formula VI (IV) Image (VI) in the presence of a base and of a phase transfer catalyst. The resulting product is reacted with an amine of formula NHR2 in an alcohol containing ether groups, such as diethylene glycol, to provide a compound of formula I. This process avoids the impurities, particularly coloured ones, and by- products obtained by the known processes for compounds ot this type.

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