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In weak alkaline aqueous medium, 4‐(hydroxyphenyl)‐2‐(N,N‐dialkylamino)‐1,3‐dithiolium salts led to the corresponding dipolar betaines. These compounds were described as zwitterionic phenolates with an intramolecular charge‐transfer UV/Vis absorption and represent useful precursors for the preparation of the first 1,3‐dithiolium chlorides.
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Birsa et al. (2003) studied this question.
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