Benzimidazoles

Details Benzimidazoles Benzimidazoles

1981-12-18

1985-09-17

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40504

Patent

active

045422222

ABSTRACT:
The novel benzimidazoles have the formula ##STR1## in which A is the radical ##STR2## R.sub.1 is cyanomethyl, 1-cyanoethyl or, if n is the number 1, also 2-cyanoethyl or C.sub.3-6 -carboalkoxymethyl, R.sub.2 is C.sub.1-4 -alkyl or C.sub.3-4 -alkenyl, R.sub.3 is cyanomethyl, cyanoethyl or C.sub.3-6 -carboalkoxymethyl, R.sub.4 and R.sub.5 independently of one another are hydrogen or chlorine, X.sup..crclbar. 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.

REFERENCES:
patent: 3637734 (1972-01-01), Harnisch
patent: 3940417 (1976-02-01), Schlaepfer
patent: 4001138 (1977-01-01), Lohmann
patent: 4384121 (1983-05-01), Meyer

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