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    • 3. 发明专利
    • PROCESS FOR THE PREPARATION OF XANTHENE DYESTUFFS
    • CA1064916A
    • 1979-10-23
    • CA242170
    • 1975-12-19
    • HOECHST AG
    • HAHNKE MANFREDKOHLHAAS FOLKERMEININGER FRITZPAPENFUHS THEODOR
    • C09B11/00C09B11/24C09B11/28C09B57/00
    • of the disclosure: A process for the preparation of xanthene dyestuffs of the general formula , (in which R1 and R2 are identical or different, each representing an optionally substituted aliphatic or optionally substituted araliphatic or cycloaliphatic radical, or R1 represents also a hydrogen atom or a carbocyclic aromatic or heterocyclic radical, or R1 and R2 together with the N-atom form a heterocyclic radical optionally containing further hetero-atoms, the benzene nucleus A may optionally contain substituents, and m stands for the integer 1,2, 3, 4 or zero) had been found wherein the inner salt of a 3,6-dihalogeno-9-(2'-sulfophenyl)-xanthene-9-ol of the formula (in which X stands for a halogen atom and A has the abovementioned meaning) is reacted with a primary or secondary amine of the formula , (in which R1 and R2 have the meanings specified as above) in a polar solvent which is free from acid groups; to obtain the sulfo compounds, the product is subsequently sulfonated. The improvement in this process is to carry out the reaction of the xanthenol with the amine in stoichiometrical amounts and in the presence of an inorganic acidbinding agent and/or an acid-binding tertiary aliphatic or cycloaliphatic amine, of pyridine or of a pyridine derivative. The novel process has the advantage of yielding dyestuffs of high quality with a strong color intensity and brilliancy, a high fastness to light and a uniform dyeing behaviour. Furthermore, the dyestuffs are obtained in very good yields avoiding the high charge of the waste water of present processes of the dyestuff itself or its starting components used in excess.
    • 8. 发明专利
    • BR8204868A
    • 1983-08-02
    • BR8204868
    • 1982-08-19
    • HOECHST AG
    • KOHLHAAS FOLKERMEININGER FRITZSTEURNAGEL HANS HELMUT
    • C09B62/51C09B62/085C09B62/44D06P1/382D06P1/384D06P3/10D06P3/66
    • 1. Water-soluble monoazo compounds of the general Formula (1) see diagramm : EP0073406,P17,F1 in which D is a phenyl or naphthyl radical, either of which is substituted and mandatorily contains at least one group which imparts solubility in water, one of the substituents can also contain, or be, a group of the formula -SO2 -Z, in which Z represents the beta-hydroxyethyl group or a group Y of the meaning indicated below, M is a hydrogen atom or the equivalent of a monovalent, divalent or trivalent metal, R is the methyl group, a carboxy group or a carbalkoxy group of 1 to 4 C atoms in the alkyl radical, R**1 is a hydrogen atom or an alkyl group of 1 to 4 C atoms, R**2 is a hydrogen atom, an alkyl group of 1 to 4 C atoms, an alkoxy group of 1 to 4 C atoms or a chlorine atom, R**3 is hydrogen atom, an alkyl group of 1 to 4 C atoms or an alkoxy group of 1 to 4 C atoms, the formula moieties R**1 , R**2 , R**3 and R can be identical to or different from one another, Y is the vinyl group, or an ethyl group which contains, in the beta-position, a radical which can be eliminated as an anion under alkaline conditions, Hal is a chlorine or fluorine atom.