Mixture of benzoxazole derivatives

Details Mixture of benzoxazole derivatives Mixture of benzoxazole derivatives

1977-11-07

1978-08-29

Edmundson, F. C.

Compositions

Organic luminescent material containing compositions

Optical brightening compositions

260307D, C09K 1106, C07D26356

Patent

active

041102460

ABSTRACT:
Compounds of the formula ##STR1## wherein R.sup.1 to R.sup.8 each mean, independent from one another, a hydrogen atom or a non chromophoric substituent, R.sup.9 means a hydrogen atom, an alkyl group, a halogen atom, preferably a chlorine or bromine atom, an optionally functionally modified carboxy or sulfo group. They are prepared by reacting 1 mol of 1,7-naphthalene dicarboxylic acid or its acid chloride with 2 mols of an o-aminophenol and subsequent cyclization of the di-N,N'-acyl compounds obtained in the first step. These compounds are valuable optical brighteners.

REFERENCES:
patent: 3314894 (1967-04-01), Niylas et al.
patent: 3336330 (1967-08-01), Schinzel et al.
patent: 3767664 (1973-10-01), Weber
patent: 3974172 (1976-08-01), Sahm et al.
patent: 3993659 (1976-11-01), Meyer

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