Abstract
THE colour base of neutral red, 2-amino-8-N,N-dimethylamino-3-methylphenazine, together with 2-amino-8-N,N-dimethylaminophenazine (the colour base of ‘neutral violet’ in German usage), the amphoteric 8-amino-2-phenazinol, and 2-amino-7-N,N-di-methylaminophenazine have been made for the first time by unambiguous means: bomb-tube reactions of aqueous ammonia with the corresponding chloro- or bromo-N,N-dimethylaminophenazines, or with the halogenated 2-phenazinol1. The phenazines were made by ring closure through the nitro group of the corresponding 2-nitrodiphenylamines, according to the method of Waterman and Vivian2.
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References
Vivian, J. Org. Chem., 21, 565 (1956).
Waterman and Vivian, J. Org. Chem., 14, 289 (1949).
Clark, Indust. Eng. Chem., Anal. Ed., 13, 820 (1941).
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VIVIAN, D., BELKIN, M. Unexpected Anomalies in the Behaviour of Neutral Red and Related Dyes. Nature 178, 154 (1956). https://doi.org/10.1038/178154a0
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DOI: https://doi.org/10.1038/178154a0
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