Process for producing 2-chloropyridines

Details Process for producing 2-chloropyridines Process for producing 2-chloropyridines

C - Chemistry, Metallurgy

07

D

260/295

C07D 213/61 (2006.01)

Patent

CA 1176635

Process for producing 2-chloropyridines 5-13518 /= Abstract of the Disclosure Production of 2-chloropyridines of the formula I Image (I) wherein R independently of oneanother is C1-C4-alkyl, C1-C4-halogenalkyl, halogen or carboxyl and n is zero or a number from one to four, with the proviso that at most two substituents R can be alkyl, halogenoalkyl or carboxyl at the same time, and that if R is chlorine and n is two, one of them must not occupy the 3- or 5-position of the pyridine ring, by reacting a 2-pyridone of the formula II Image (II) wherein R and n have the meanings given above at 30-150°C with phosgene in the presence of an N,N-disubstituted formamide of the formula III Image (III) in which R1 and R2 can be identical or different and are each an alkyl group having l to 4 carbon atoms, or R1 and R2 together with the nitrogen atom form the pyrrolidino, piperidino or morpholino ring, and in the presence of an inert solvent. 2-chloropyridines are valuable intermed;ates for producing herbicidally active .alpha.-[4-(pyrid-2-yloxy)-phenoxy]-alkanecarboxylic acids and derivatives thereof.

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