Pentachloropyridine → 2,3,4,5-Tetrachloropyridine

HRID 1704621

Reaktionsgleichung

Reaktionsgleichung von HRID 1704621
Cl[C:2]1[N:7]=[C:6]([Cl:8])[C:5]([Cl:9])=[C:4]([Cl:10])[C:3]=1[Cl:11].O.NN.N(C1C=CC=CN=1)N.ClC1N=C(Cl)C(Cl)=C(NN)C=1Cl>C(O)C.S([O-])([O-])(=O)=O.[Cu+2].[Ag]=O>[Cl:11][C:3]1[C:4]([Cl:10])=[C:5]([Cl:9])[C:6]([Cl:8])=[N:7][CH:2]=1

Komponenten

8

Edukt 4

HCID 16584PentachloropyridineHCID 24654Hydrazine hydrate (1:1)HCID 786452-HydrazinopyridineHCID 125021922,3,5,6-Tetrachloro-4-hydrazinylpyridine

Produkt 1

HCID 760512,3,4,5-Tetrachloropyridine

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 24462Copper SulfateKatalysatorHCID 92152Silver(II) oxideKatalysatorHCID 702EthanolLösungsmittel2×

Versuchsvorschrift

Another method of preparing tetrachloropyridines is taught in Collins et al., J. Chem. Soc. (C) pages 167-174 (1971) wherein pentachloropyridine is reacted with hydrazine hydrate in ethanol and the resulting tetrachloro-4 and/or 2-hydrazinopyridine is oxidized with aqueous copper sulfate or silver oxide in ethanol. This reference also teaches pyrolyzing tetrachloro-4-hydrazinopyridine in sand at 160° C. to yield tetrachloropyridine. In addition, this reference teaches the preparation of 2,3,6-trichloropyridine from the reaction of tetrachloro-4-hydrazinopyridine with cuprous oxide in hot water.

Aufarbeitung

  1. customat 160° C.

Quellen und Nachweise

ORD-Eintrag
ord-4c6c63d271f0442288fa304b35f89b8e
Quelldatensatz
uspto-grants-1978_11
Patentnummer
US04127575

Verknüpfte Notizen

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