Bulletin of the Chemical Society of Japan p. 2526 - 2530 (1985)
Update date:2022-08-12
Topics:
Onari, Yasuo
The substituent effect on the ozone decoloration of 1-(m-substituted phenylazo)-2-naphthol-6-sulfonic acids (PANSA) in aqueous solutions was investigated.Both the acidities of PANSA and the variation of the ozone decoloration rates of them increased compared to those of the corresponding 1-(m-substituted phenylazo)-2-naphthol-3,6-disulfonic acids (PANDSA).The relationships between the decoloration rates and the indexes (pKOH and ?m values) of the basicities of the dyes, however, indicated nearly the same characteristics between the data of these two series of dyes, and the ozone decoloration reactions of PANSA appeared to proceed by nearly the same mechanism as those of PANDSA.The changes of the keto-enol ratios of the dyes with their ozone decolorations suggested that the decoloration rates might rise as the reduction rates of their keto-enol ratios increased.It seems likely that the chief organic product that was finally produced in these resctions is oxalic acid.
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