Preparation of azo compounds having carboxyl and cyano groups

Details Preparation of azo compounds having carboxyl and cyano groups Preparation of azo compounds having carboxyl and cyano groups

1984-11-29

1987-08-04

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

526219, 528292, 534587, 534838, 534886, 534887, C07C 1026, C07C10702, C08F 404, C08G 6368

Patent

active

046847170

ABSTRACT:
A process for the preparation of a diazocyano acid, which comprises reacting a keto-acid or its sodium salt with a cyanogen compound such as sodium cyanide or hydrogen cyanide and a hydrazine in water to form a concentrated aqueous solution of a hydrazo compound, adding acetone or acetone and water to the concentrated aqueous solution to form an acetone-water solution of the hydrazo compound, adding an oxidant such as chlorine gas to the solution to oxidize the hydrazo compound and form a diazocyano acid, forming at least two transparent liquid layers by adding acetone and/or water to the obtained reaction mixture during or after oxidation if necessary, and further adding sodium chloride to the reaction mixture if necessary, and separating and recovering the upper layer of the acetone-water solution containing the diazocyano acid from the mixture.

REFERENCES:
patent: 2520338 (1950-08-01), Robertson
patent: 3192196 (1965-06-01), Vidal et al.
patent: 3285949 (1966-11-01), Siebert
patent: 3775395 (1973-11-01), Koyanagi et al.
patent: 4101522 (1978-07-01), Sheppard et al.
patent: 4272435 (1981-06-01), Matsuda et al.

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