A series of [1,3]thiazino[3,2-a]benzimidazolium salts modified in the benzene ring by a condensed 1,4-dioxane ring has been prepared. Reaction with epichlorohydrin occurs with recyclization to form derivatives of 3-(2,3-epithiopropyl)benzimidazol-2-one.

A new low-basicity functional detergent, namely, 1-methyl-3-hexadecyl-2-(oximinomethyl)imidazolium bromide (pK a = 7.74) is proposed for the efficient decomposition of acyl-containing ecotoxicants under mild conditions (pH ≈ 9.0). The use of this compound provides for rapid decomposition of model substrates, namely, 4-nitrophenyl esters of diethylphosphonic, diethylphosphoric, and 4-toluenesulfonic acids. The title compound is not less efficient than high-basicity supernucleophilic functional detergents with pKa; 10.0.