Bleaching activators are compounds with O‐ or N‐bounded acetyl groups which are able to react with the strongly nucleophilic hydroperoxy anion to yield peroxyacetic acid. The peroxyacetic acid is decomposed in weakly basic media in a bimolecular reaction forming singlet oxygen. The maximum of the decomposition rate of peroxyacetic acid at pH = 8.3 is also the maximum of bleaching activity of systems containing both bleaching activators and sodium perborate; therefore singlet oxygen must play a decisive role in the activated bleaching of textiles during the washing process. Different bleaching activators can be compared both on the basis of their reaction rates with hydrogen peroxide in weakly basic media and on the basis of their reaction rates with piperidine in dioxane. A great number of potential bleaching activators was studied and compared.

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The bleaching activators 1,5‐diacetyl 2,4‐dioxo‐hexahydro‐1,3,5‐triazine (DADHT), tetraacetyl ethylenediamine (TAED), tetraacetyl glycolurile (TAGU), N,N′‐diacetyl N,N′‐dimethyl urea (DDU) and pentaacetyl glucose (PAG) are efficient acetylating agents which convert primary and secondary amines into their N‐acetyl derivatives. The rates of the reactions of the bleaching activators mentioned with piperidine were determined in the temperature range 20 to 90°C using dioxane as the solvent. The kinetic constants can be regarded as rough measures of the activity of the bleaching activators.

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