| 摘要 |
<p>5-12872/= Process for producing 2,3,5-trichloropyridine Production of 2,3,5-trichloropyridine by reacting 3,5-dichloro-2-pyridone at 30 to 150.degree. with phosgene in the presence of an N,N-disubstituted formamide of the formula in which R1 and R2 can be identical or different and are each an alkyl group having 1 to 4 carbon atoms, or R1 and R2 together with the nitrogen atom form the pyrrolidino,: piperidino or morpholino, and in the presence of an inert solvent. 2,3,5-trichloropyridine is a valuable intermediate for producing herbicidally active .alpha.-¢4-(3',5'-dichloropyrid-2-yloxy)-phenoxy!-alkanecarboxylic acids and derivatives thereof.</p> |
