| 摘要 |
<p>The cpds. are of formula (I): (where R1-5 and H or 1-4C alkyl; R2, R3 and R5-7 are H, Cl, Br, F, Me, Et, MeO or EtO; and R4 is H, alkyl, benzyl, phenylethyl or Ph, opt. substd. by Cl, Br, Me, Et, MeO, EtO, CN, dialkylamino or -SO3H). (I) are used as optical brighteners and optical brightener intermediates. Substrates which can be brightened with (I) are actyl onitrile polymers, wool, cellulose esters or polyamides. "In bulk" brightening is possible. (I) have good light-, heat- and wet-fastness.</p> |
