FIELD: analytical chemistry. SUBSTANCE: product: 2,6-diphenyl-4-(4-dimethylaminostyryl)-pyrilium chloride, empirical formula is C27H24ClO, m. p. is 228 C (with decomposition). Reagent 1: 4-methyl-2,6-diphenylpyrilium chloride. Reagent 2: p-dimethylaminobenzaldehyde. Process conditions: 35 h with the following time lag at the room temperature for 2 days. EFFECT: increased sensitivity of anionic surface-active substances assay, enlarged capability of method. 12 tbl
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