Process for the synthesis of nitrite ion-containing 1:1 complexe

Details Process for the synthesis of nitrite ion-containing 1:1 complexe Process for the synthesis of nitrite ion-containing 1:1 complexe

1975-06-02

1977-01-25

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260147, 260149, 260150, 260566F, C07C11900, C07C13100, C09B 4510, C09B 4520

Patent

active

040050670

ABSTRACT:
By metallization of metallizable monoazo or azomethine dyes with cobalt-donating compounds in the presence of a nitrite, especially NaNO.sub.2, 1:1 cobalt complexes containing a nitrite ion are obtained in a high degree of metallization which can be reacted with metallizable monoazo or azomethine dyes to give very homogeneous 2:1 cobalt complexes in a high degree of purity. This is particularly advantageous when asymmetrical 2:1 cobalt complexes are to be prepared. The process is particularly useful for the preparation of nitrite ion-containing 1:1 complexes of cobalt and a monoazo compound of the formula ##STR1## wherein X is --OH or --NHR,

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Venkataraman, "The Chemistry of Synthetic Dyes," vol. III, pp. 303-373 (1970).
Merck Index, 7th Edition, p. 957 (1960).

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