Process for the preparation of the herbicide ethyl .alpha.-2-dic

Details Process for the preparation of the herbicide ethyl .alpha.-2-dic Process for the preparation of the herbicide ethyl .alpha.-2-dic

1996-07-18

1997-04-15

Morris, Patricia L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D24912

Patent

active

056211120

ABSTRACT:
A process is disclosed for the preparation of the herbicide ethyl .alpha.-2-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2 ,4-triazol-1-yl]-4-fluorobenzenepropionate by the simultaneous diazotization of 4-difluoromethyl-4,5-dihydro-3-methyl-5-oxo-1-(5-amino-2-fluoro-4-chloro-p henyl)-1H-1,2,4-triazole (the Amine) and arylation of ethyl acrylate with the diazotized Amine. In the process the following reagents are added in sequence and, under specified conditions, to a cooled, stirred solution of the Amine in acetone: cuprous chloride, hydrochloric acid, ethyl acrylate, and sodium nitrite.

REFERENCES:
patent: 5125958 (1992-06-01), Poss

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