Process for the preparation of cationic naphtholactam dyestuffs
AssigneeBayer Aktiengesellschaft
InventorAlfred Brack
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Abstract
Water-soluble cationic dyestuffs are prepared by the reaction of dyestuffs of the formula ##STR1## wherein R and R.sub.1 represent alkyl, R.sub.2 represents alkyl, aralkyl, cycloalkyl or aryl or represents alkylene which is bonded to the ring A in the o-position relative to the nitrogen atom, and An.sup.- represents an anion, and wherein the said radicals, the ring A and the naphthalene ring can contain nonionic substituents customary in dyestuff chemistry, and wherein at least one of the radicals R and R.sub.1 contains a hydroxyl group or a halogen atom or another group which can be split off as an anion, with polyhydric alcohols in the presence of a catalyst.
Claims6
A process for the preparation of a dyestuff of the formula ##STR23## wherein R.sub.3 ' and R.sub.4 ' independently of one another represent C.sub.1 -C.sub.6 -alkyl, which can be substituted by a C.sub.1 -C.sub.4 -alkoxy, cyano, aminocarboxyl or C.sub.1 -C.sub.4 -alkoxycarbonyl group, and at least one of the radicals R.sub.3 ' or R.sub.4 ' is the radical ##STR24## n and n.sub.1 independently of one another denote 0, 1 or 2, R.sub.5 and R.sub.5 ' independently of one another denote hydrogen, methyl, ethyl or hydroxyl,
- R.sub.6 and R.sub.6 ' independently of one another denote hydrogen, methyl or ethyl, or
- R.sub.5 and R.sub.6 conjointly denote methylene or ethylidene, D denotes a direct bond, vinylene, ethinylene, sulphur or --O--(CH.sub.2 --CH.sub.2 O).sub.x,
- x=0, 1 or 2,
- R.sub.2 ' represents C.sub.1 -C.sub.6 -alkyl, which can be substituted by a C.sub.1- C.sub.4 -alkoxy, cyano, aminocarbonyl or C.sub.1 -C.sub.4 -alkoxycarbonyl group;
- or represents phenyl, cyclopentyl, cyclohexyl, benzyl or phenylethyl, which, in the rings, can be substituted by 1-5 halogen or C.sub.1 -C.sub.4 -alkyl groups or by 1 or 2 hydroxyl, C.sub.1 -C.sub.4 -alkoxy or nitro groups,
- R.sub.7 represents C.sub.1 -C.sub.6 -alkyl, halogen, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, cyano, aminocarbonyl, C.sub.1 -C.sub.4 -alkoxycarbonyl, amino, acetylamino, mono- and di-C.sub.1 -C.sub.4 -alkylamino, C.sub.1 -C.sub.4 -alkylsulphonylamino, C.sub.1 -C.sub.4 -alkylmercapto, cyanoethylmercapto, phenylmercapto, phenylmercapto substituted by chlorine or methyl, or aminosulphonyl or C.sub.1 -C.sub.4 -alkylsulphonyl,
- R.sub.8 represents hydrogen, methyl, ethyl or C.sub.1 -C.sub.4 -alkoxy or a R.sub.8 which is in the o-position relative to the nitrogen represents, conjointly with R.sub.2, propylene-(1,2) ethylene, methyl-substituted propylene-(1,3) or methyl-substituted ethylene, m represents 0, 1 or 2 and
- An.sup.- represents an anion,
- consisting essentially reacting a dyestuff of the formula ##STR25## wherein R' and R.sub.1 ' independently of one another represent C.sub.1 -C.sub.6 -alkyl, which can be substituted by a C.sub.1 -C.sub.4 -alkoxy, cyano, aminocarbonyl or C.sub.1 -C.sub.4 -alkoxycarbonyl group, and at least one of the radicals R' and R.sub.1 ' is ethyl substituted by chlorine, bromine or hydroxyl, with a polyhyric alcohol of the formula ##STR26## at 80.degree. to 160.degree. C. in the presence of a catalyst selected from the group consisting of an aluminium oxide, active alumina, silica, active zeolite finely divided platinum, phosphorus pentoxide, polyphosphoric acid, phosphoric acid, sulfuric acid, titanium oxide, zirconium oxide, thorium oxide and polystyrene-sulphonic acids.
Dependencies are inferred from the claim text.