Add time:09/07/2019 Source:sciencedirect.com
Ferric chloride oxidation of 2,4′-diamino-4- and -5-cyanodiphenylamines led to 2-amino-8- and -7-cyanophenazines respectively which could be hydrolysed to the corresponding 7- and 8-aminophenazine-2-carboxylic acids. 8-Aminophenazine-2-carboxylic acid was also made by the oxidative cyclization in boiling nitrobenzene of 2,4′-diaminodiphenylamine-4-carboxylic acid; 4′,6-diaminodiphenylamine-2-carboxylic acid similarly gave 7-aminophenazine-1-carboxylic acid.
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