Several new organic substrates have been found to promote oscillations in batch conditions in the Briggs−Rauscher oscillating system. The new substrates, crotonic acid, acrylic acid, anisole, and p -nitrophenol, react with iodine (I) by either addition or substitution reactions. Rate constants for reactions of these four compounds with HOI have been determined. Previously known substrates have active methylene hydrogens and react with I 2 via an enol mechanism. Some type of active reduction of HIO 2 to HOI (other than by iodide) must be included in the mechanism to allow the simulation of oscillations with the new substrates.
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Furrow et al. (2002) studied this question.
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