Sandoz Gmbh

Peter Stuart Littlewood

Alec Victor Mercer

Fritz Fleck

Ivan Joseph Bolton

Stable solutions of optical brighteners

Disclosed are compounds of Formula I, ##STR1## where either R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently, are hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen, cyano, carboxy, alkoxy(C.sub.1-4)carbonyl, --CONR.sub.6 R.sub.7, --SO.sub.2 NR.sub.6 R.sub.7, --SO.sub.2 R.sub.8, alkyl(C.sub.1-4)carbonyloxy, or C.sub.1-4 alkoxy monosubstituted by phenyl, alkoxy(C.sub.1-4)carbonyl, cyano, carboxy or --CONR.sub.6 R.sub.7, with the proviso that a maximum of one of R.sub.1 and R.sub.2 and a maximum of one of R.sub.3 and R.sub.4 can signify a group selected from cyano, carboxy, alkyl (C.sub.1-4)carbonyloxy, --CONR.sub.6 R.sub.7, --SO.sub.2 NR.sub.6 R.sub.7 and --SO.sub.2 R.sub.8,

2'-Benzothiazolyl-and 2'-benzoxazolyl-2-benzimidazoles

Disclosed are compounds of formula I, ##STR1## in which either R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each signifies a hydrogen atom, a chlorine or fluorine atom, an alkyl radical of 1 to 4 carbon atoms, an alkoxy radical of 1 to 4 carbon atoms, a cyano group, a group --SO.sub.3 M, an unsubstituted phenyl radical or a phenyl radical substituted by up to 2 substituents selected from chlorine, fluorine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms and the group --SO.sub.3 M, with the proviso that only one of R.sub.1, R.sub.2 and R.sub.3 signifies an unsubstituted or substituted phenyl radical

1,3-Diaryl-2-pyrazoline derivatives

Disclosed are optical brightening agents, such agents being 2-(2')-benzimidazoyl-furans substituted in the 5-position of the furan ring by a 1-aryl-pyrazolyl-3, -4 or -5 radical, by a pyrazolyl-1 radical or by a 2-aryl-v-triazolyl-4 radical, such compounds being in free base, acid addition or quaternary ammonium salt form.

5-Substituted-2-(2')-benzimidazoyl-furans

The invention provides novel pyrazoline derivatives which are useful as optical brighteners.

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Ilkley, United Kingdom

Peter Stuart Littlewood