Diethyl ethylphosphonate → 2,3,5,6-Tetrachloropyridine

Beteiligte Stoffe

Reaktionsschritte

Using the method described in Example 1, 12.76 g (0.05 mol) of pentachloropyridine is reacted with 4.1 g (0.063 gram atom) of zinc dust and 7.22 g (0.135 mol) of ammonium chloride, the solvent being in this case diethylethanephosphonate instead of dimethylmethanephosphonate. There is obtained 10.2 g (93% of theory) of crude 2,3,5,6-tetrachloropyridine, m.p. 86° to 88° C., which contains, according to gas-chromatographical analysis, 92.7% of 2,3,5,6-tetrachloropyridine, 1.2% of 2,3,5-trichloropyridine, 2.2% of 2,3,6-trichloropyridine and 2.8% of pentachloropyridine.

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