| abstract |
Merocyanine-based labeling dyes (I) and (II), containing a 2- or 4-chromenylidene group and a trioxopyrimidin-5-ylidene group, are new. <??>Merocyanine-based labeling dyes of formulae (I) and (II), containing a 2- or 4-chromenylidene group and a trioxopyrimidin-5-ylidene group, are new: <??>R<1> - R<12> = H, Cl, Br, an aliphatic or monocyclic aromatic residue (which has a total of up to 12C and optionally contains in substituent residues up to 4 O and 0-2 N, one S or one S plus one N) or amino (optionally having substituents having a maximum of 8C, consisting of C, H and at most two sulfonic acid groups); or <??>R<1>+R<2>, R<2>+R<3>, R<3>+R<4>, R<5>+R<6>, R<6>+R<7> = 5- or 6-membered (non-)aromatic ring (optionally containing N); <??>X = O or S; <??>n = 0 - 3; and <??>provided that R<2> includes an amino and at least one of R<1> and R<3> includes an SO3<-> residue. |