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Molecules 2012, 17(12), 14377-14392; doi:10.3390/molecules171214377
Article

Formation of Sulfonyl Aromatic Alcohols by Electrolysis of a Bisazo Reactive Dye

1, 1, 2, 3, 3 and 2,*
Received: 16 November 2012 / Revised: 29 November 2012 / Accepted: 29 November 2012 / Published: 5 December 2012
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Abstract

Five sulfonyl aromatic alcohols, namely 4-((2-hydroxyethyl)sulfonyl)phenol, 4-((2-(2-((4-hydroxyphenyl)sulfonyl)ethoxy)vinyl)sulfonyl)phenol, 4-(ethylsulfonyl)phenol, 4-(vinylsulfonyl)phenol and 5-((4-aminophenyl)sulfonyl)-2-penten-1-ol were identified by LC-ESI-Qq-TOF-MS as products formed by electrolysis of the bisazo reactive dye Reactive Black 5 (RB5). Since electrolyses were performed in an undivided cell equipped with Ni electrodes in alkaline medium, amines like 4-(2-methoxyethylsulfonyl)benzene-amine (MEBA) with m/z 216 were also suspected to be formed due to the plausible chemical reaction in the bulk or the cathodic reduction of RB5 and its oxidation by-products. Aiming to check this hypothesis, a method was used for the preparation of MEBA with 98% purity, via chemical reduction also of the dye RB5. The logP of the synthesized sulfonyl aromatic compounds was calculated and their logkw values were determined chromatographically. These data were discussed in regard to the relationship between hydrophobicity/lipophilicity and toxicity.
Keywords: sulfonyl aromatic alcohols; 4-(2-methoxyethylsulfonyl)benzenamine; reactive black 5; electrolysis products; logP sulfonyl aromatic alcohols; 4-(2-methoxyethylsulfonyl)benzenamine; reactive black 5; electrolysis products; logP
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Elizalde-González, M.P.; Arroyo-Abad, U.; García-Díaz, E.; Brillas, E.; Sirés, I.; Dávila-Jiménez, M.M. Formation of Sulfonyl Aromatic Alcohols by Electrolysis of a Bisazo Reactive Dye. Molecules 2012, 17, 14377-14392.

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