| 摘要 |
Compounds having the formula: in which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; R 1 is hydrogen or hydroxy; R 2 is C 1 -C 4 alkyl or phenyl; Y is -C(=O)-NR 3 R 4 in which R 3 and R 4 , independently, are hydrogen or C 1 -C 4 alkyl, -SO 2 -NR 3 R 4 in which R 3 and R 4 have their previous significance, -C(=O)-R 2 in which R 2 has its previous significance or -C(=O)-OM in which M has its previous significance; and X is NH or O, or X-R 2 denotes a morpholino group; provided that those compounds are excluded in which: a) Y is -C(=O)-OM in which M has its previous significance; X is NH; and R 2 is phenyl; b) R 1 is hydrogen; Y is -C(=O)-CH 3 ; and X-R 2 denotes a morpholino group; or c) R 1 is hydrogen; Y is -C(=O)-OM in which M has its previous significance; X is NH; and R 2 is methyl; are useful as ultraviolet absorbing and fluorescent whitening agents. |
