| 摘要 |
The novel benzimidazoles have the formula <IMAGE> in which A is the radical <IMAGE> +TR <IMAGE> R1 is cyanomethyl, 1-cyanoethyl or, if n is the number 1, also 2-cyanoethyl or C3-6-carboalkoxymethyl, R2 is C1-4-alkyl or C3-4-alkenyl, R3 is cyanomethyl, cyanoethyl or C3-6-carboalkoxymethyl, R4 and R5 independently of one another are hydrogen or chlorine, X(-) is a colorless anion of an organic or inorganic acid and n is the number 0 or 1. They are used for the fluorescent brightening of organic materials.
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