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US 4,033,963 AGranted
Naphthoquinone derivatives
AssigneeSandoz Ltd.
InventorBansi Lal Kaul
Life of this patent
Estimating the term…
Abstract
The present invention relates to naphthoquinone derivatives of formula I, ##STR1## in which R.sub.1 signifies a halogen atom, a nitro group or an unsubstituted or substituted alkoxy or amino group, R.sub.2 signifies the atoms necessary to form an unsaturated ring system, which ring system has 1 or 2 nuclei and is unsubstituted or substituted, R.sub.3 signifies an unsubstituted or substituted 5-triazinyl or pyrimidyl radical, and n is 0, 1 or 2, Which compounds are free from sulphonic acid groups are useful as pigments or disperse dyes.
Claims4
A compound of formula Ia, ##STR32## wherein R.sub.8 is a radical of formula P
- --CH.dbd.CH--CH.dbd.CH-- P
- or a radical of formula Q ##STR33## which radicals are unsubstituted or mono-substituted by chloro, bromo, methyl, methoxy, aminocarbonyl, methylaminocarbonyl, ethylaminocarbonyl, dimethylaminocarbonyl, diethylaminocarbonyl, phenylaminocarbonyl, methoxycarbonyl or ethoxycarbonyl, and
- R.sub.9 is pyrimidyl or pyrimidyl substituted by up to three substituents selected from the group consisting of hydroxy, methoxy, ethoxy, amino, methylamino, ethylamino, dimethylamino, diethylamino, di-hydroxyethylamino, phenylamino, chloro, bromo and mono-chlorophenylamino.
Dependencies are inferred from the claim text.