4-Benzoxazolyl-4'-oxadiazolyl stilbene optical brighteners

Details 4-Benzoxazolyl-4'-oxadiazolyl stilbene optical brighteners 4-Benzoxazolyl-4'-oxadiazolyl stilbene optical brighteners

1977-03-04

1979-02-27

Waltz, Thomas

Harness for working animal

252 89B, 260307G, 542432, 542435, C07D40510

Patent

active

041420446

ABSTRACT:
Compounds of the formula ##STR1## wherein X is O or S, A is a group of the formula ##STR2## and R.sub.1, R.sub.2 and R.sub.3 are non-chromophorous substituents. They are prepared by reacting a 4'-benzoxa(thia)zolyl-2-stilbene-4-carbonic acid chloride with an amidoxim containing the group R.sub.3 or by reacting a 4'-benzoxa(thia)zolyl-2-stilbene-4-amidoxime with an acid chloride containing the group R.sub.3.
These compounds are used as optical brighteners.

REFERENCES:
patent: 3351591 (1967-11-01), Siegrist et al.
patent: 3586673 (1971-06-01), Bloom et al.
patent: 3689481 (1972-09-01), Scheuermann et al.
patent: 3830848 (1974-08-01), Siegrist
patent: 3994907 (1976-11-01), Domergue
patent: 4003909 (1977-01-01), Narayanan et al.
patent: 4014871 (1977-03-01), Kormany et al.
patent: 4022901 (1977-05-01), Narayanan et al.

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