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6861541 Method for preparation of an anthraquinone colorant composition  
Disclosed herein is a method for producing a 1-[4-(biphenyl-4-carbonyl)]phenylaminonthraquinone colorant composition where the method comprises: reacting 4-halobenzoic acid with about 1 mole to...
5493036 Fibre-reactive anthraquinone dyes, their preparation and the use thereof  
The invention relates to fibre-reactive anthraquinone dyes of formula ##STR1## wherein R 1 , R 2 , B, U, R and n are as defined in claim 1. The anthraquinone dyes of formula (1) are suitable for...
5387704 Preparation of anthraquinones  
Process for preparing amino- and carbamoyl-substituted anthraquinones by Diels-Alder reaction of an N-butadienylcarbamic acid ester of the formula H 2 CCH--CHCH--NH--COOR 2 , wherein R 2 is...
5213665 Process for producing 1-aminoanthraquinones  
A process for producing 1-aminoanthraquinones represented by formula (C) ##STR1## wherein R 1 and R 2 , independently from each other, denote one type selected from a hydrogen atom, an alkyl group...
5204370 Bis-(hydroxyalkylamino)-anthraquinone inhibitors of protein kinase C  
The present invention provides novel substituted anthraquinones having the formula ##STR1## wherein R 1 and R 2 are independently H, C 1 -C 10 alkyl, aryl, arylalkyl, alkylaryl; n and m are...
5182395 Isopropyl 1-amino-4-m-toluidinoanthraquinone-2-carboxylate  
Disclosed are a novel compound represented by the formula ##STR1## and compositions for sublimation transfer records and for color toners containing the same.
5141957 1,4-bis-(amino-hydroxyalkylamino)-anthraquinones for inhibiting protein kinase C  
The present invention provides novel substituted anthraquinones having the formula ##STR1## wherein R 1 and R 2 are independently H, alkyl, aryl, or arylalkyl; m and n are independently 1, 2,...
5132437 Synthesis of 1-aminoanthraquinone  
1-Aminoanthraquinone (1-AAQ) is synthesized by the reaction of 2-chlorobenzyl chloride and xylene in the presence of a solid acid catalyst to yield 2-chloro dimethyldiphenylmethane, subsequent...
5066820 Process for the preparation of 1-amino-2-carboxyanthraquinones  
The preparation of 1-amino-2-carboxyanthraquinones I ##STR1## (X denotes hydrogen, chlorine or bromine) by oxidation, under alkaline conditions, of a 1-aminoanthraquinone substituted in the...
5017713 Process for preparing substituted aminoanthraquinones  
Substituted aminoanthraquinone compounds, which are used for dye stuffs or intermediate thereof, represented by the formula (II) ##STR1## wherein R 3 represents a C 1 -C 6 alkyl group which may...
4950756 Preparation of 1-nitroanthraquinone-2-carboxylic acid  
1-Nitroanthraquinone-2-carboxylic acid of the formula I ##STR1## is prepared by treating novel 2-substituted 1-nitroanthraquinones of the general formula II ##STR2## where R is --CHCH--R 1 or...
4940692 Transfer of dyes  
Heat transferable dyes which compared with the prior art show better solubility and/or higher light fastness and good to excellent transfer properties have the formula (I) ##STR1## where X is H or...
4883611 Dichroic coloring agents for liquid crystal displays  
Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following...
4770818 Process for the preparation of 1-aminoanthraquinones  
There is disclosed a process for the preparation of 1-aminoanthraquinones from 5-nitro-1,4,4a,9a-tetrahydroanthraquinones with a basic reducing agent, which process is carried out under pressure in...
4610804 Anthraquinone dyes and liquid crystal compositions including the same  
A liquid crystal composition comprising a host liquid crystal material and at least one guest novel anthraquine dye dissolved in said host liquid crystal material has a high order parameter,...
4549989 Process for the preparation of monoaminoanthraquinones  
The invention relates to a process for the preparation of monoaminoanthraquinones of the formula ##STR1## wherein R is a non-ionic substituent and n is 0, 1, 2 or 3, by reduction of corresponding...
4528113 Anthraquinone dye and liquid crystal composition containing the dye  
An anthraquinone dye and a liquid crystal composition containing the dye are disclosed. The liquid crystal composition is preferably used in an electro-optic cell which enables a good color display...
4518535 Preparation of electrically conductive systems from substituted phenalenes, and the products obtained  
Air-stable, electrically conductive systems having conductivities greater than 1×10 -3 Ω -1 cm -1 are prepared by reacting a metal cation of an element of sub-group VII, VIII or I of the...
4491532 Liquid-crystal mixture with a pleochroic anthraquinone dye, and method for producing such a dye  
Liquid-crystal mixture with a pleochroic anthraquinone dye of the general formula ##STR1## with R 1 , R 3 , R 4 , R 6 =H, OH, OCH 3 , NH 2 , NHCH 3 , NO 2 , characterized by the feature that...
4464282 Organic materials  
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone...
4457855 Stable hypochlorite solution suspendable dyes  
This invention relates to dyes which are resistant to hypochlorite attack, exemplary of which are anthraquinone dyes of the general formula: ##STR1## wherein X 1 , X 2 , X 3 , X 4 , R 5 , R 6 , R 7...
4456545 Dichroitic anthraquinone dyestuffs useful in liquid crystalline dielectrics and electro-optical indicator elements  
New dichroitic dyestuffs useful as components of liquid crystalline dielectrics for electro-optical indicator elements based on the guest-host effect have the formula ##STR1## wherein W, X, Y and Z...
4405211 Liquid crystal compositions with pleochroic anthraquinone dyes  
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a...
4402854 Liquid crystals having pleochroic dyes  
Anthraquinone dyes of the general formula: ##STR1## wherein R 1 , R 3 , R 4 and R 6 are selected from the group consisting of H, OH, OCH 3 , NO 2 , NH 2 and NHCH 3 ; R 2 and R 5 are selected...
4391754 Anthraquinone compounds  
Compounds of the formula: ##STR1## wherein R 1 is alkyl or aryl; X is H, NH 2 or NHCH 3 ; one of Y and Z is OH and the other is H, NH 2 or NHCH 3 ; and one of R 2 and R 3 is H and...
4328161 Process for the preparation of 1-aminoanthraquinones  
A selective process for the preparation of 1-aminoanthraquinones from the corresponding 1-aminoanthraquinone-2-carboxylic acid by decarboxylation in an acid solution in the presence of iron or zinc...
4309221 Anthraquinone derivatives  
Anthraquinone derivatives of the formula ##STR1## or of the tautomeric formula ##STR2## in which A denotes an anthraquinone radical which is free from sulphonic acid groups and is optionally...
4296044 Process for the preparation of cationic anthraquinone dyestuffs  
Cationic anthraquinone dyestuffs of the formula ##STR1## wherein R 1 denotes hydrogen, alkyl or cycloalkyl, R 2 denotes hydrogen, alkyl or bromine, R 3 denotes alkylene, R 4 and R 5 ...
4285874 1-Isocyanato-anthraquinones  
1-Isocyanato-anthraquinones, which are valuable dyestuff intermediate products, are obtained in good yields when 1-amino-anthraquinones are introduced into phosgene or a solution of phosgene at...
4226783 α-Chlorination process  
A process for α-chlorination of side chains of electronegatively substituted aromatic compounds with dichlorine monoxide.
4187238 Anthraquinone disperse dyes  
Disperse dyes of the formula (I) ##STR1## wherein R represents substituted or unsubstituted alkyl, cycloalkyl or hydrogen, R' represents substituted or unsubstituted alkyl, cycloalkyl, aralkyl or...
4124355 Transfer dyeing with 1-amino-4-anilinoanthraquinone dyes  
A process for the transfer color printing of synthetic textile materials wherein the dyestuff used is a 1-amino-4-anilinoanthraquinone having one or two ortho substituents in the anilino group. The...
4115056 Methods for dyeing or printing using amino-anthraquinone reactive disperse dyes  
The present invention provides useful new fibre-reactive disperse dyes of the formula (1) ##STR1## wherein R 1 represents hydrogen or alkyl, R 2 represents hydrogen, alkyl, cycloalkyl, aralkyl...
4110355 Anthraquinone compounds useful in photographic processes  
This invention relates to a novel class of compounds which are capable of reacting in such a way as to form a new heterocyclic ring, and as a function of such reaction and ring formation to split...
4086252 Process for the manufacture of anthraquinone compounds  
Process for the production of α-(carboxyethylamino)anthraquinones by reacting an α-aminoanthraquinone with an alkenyl carboxylic acid in sulphuric acid medium containing boric acid, metaboric...
4080369 Disperse anthraquinone dyestuffs  
1,4-Di(hydroxy- or amino-)-2-[alkoxycarbonylmethylene(oxy or amino)phenyl(oxy)]anthraquinones. Disperse dyestuffs for synthetic textile materials, especially aromatic polyesters.
4078890 Process for the dyeing and printing of polyester material  
The invention relates to a process for the dyeing and printing of polyester material in a weakly acid, neutral or alkaline solution of at least one altered dispersion dyestuff water-soluble at an...
4076735 Process for the manufacture of aminoanthraquinones  
A process for the manufacture of aminoanthraquinones, wherein nitroanthraquinones are reacted in dipolar aprotic solvents which contain --SO 2 -- or --SO-- groups and are inert to the reactants,...
4065478 Process for the manufacture of α,α'-aminonitroanthraquinones  
A process for the manufacture of α,α'-aminonitroanthraquinones, from α,α'-dinitroanthraquinones, wherein the α,α'-dinitroanthraquinones are reacted with ammonia in dipolar aprotic solvents...
4046785 Process for preparing aminoanthraquinones  
A process for preparing aminoanthraquinones of high purity, which comprises catalytically hydrogenating nitroanthraquinones in the suspended state in an aqueous medium in the presence of a...
4044030 Process for the manufacture of N-alkylamino- and N,N-dialkylaminoanthraquinones  
A process for the manufacture of N-alkylamino- and N,N-dialkylaminoanthraquinone from the corresponding nitroanthraquinones, which comprises reacting substituted or unsubstituted...
4044029 Amino-anthraquinone reactive disperse dyes  
The present invention provides useful new fibre-reactive disperse dyes of the formula (1) ##STR1## wherein R 1 represents hydrogen or alkyl, R 2 represents hydrogen, alkyl, cycloalkyl, aralkyl...
4016182 Process for the production of aminoanthraquinone compounds  
The present invention concerns a novel process for the reduction of a nitro-anthraquinone compound of formula I: ##STR1## wherein M IS AN INTEGER 1, 2 OR 3, AND n is an integer 1, 2 or 3, The...
3966775 Process for the preparation of 1-substituted anthraquinones  
A process for the preparation of 1-substituted anthraquinones represented by the general formula I ##EQU1## where, in the formula, R 1 and R 2 represent individually a hydrogen atom or methyl...
3933866 Process for the manufacture of amino-anthraquinones  
A process for the manufacture of aminoanthraquinones from nitroanthraquinone, wherein the nitroanthraquinones are treated with ammonia in dipolar aprotic solvents that are inert towards ammonia and...
3928395 Process for the nitration of aromatic compounds  
The present invention provides a new process for the nitration of aromatic compounds, wherein the nitration is carried out with concentrated nitric acid, nitrogen oxides, acetyl nitrate, or a...
3907837 Production of aromatic ketones  
A method of preparing aromatic ketones by reaction of aromatic compounds with acyl chlorides or acyl anhydrides in the presence of catalytic amounts of an aromatic polynitrosulfonic acid, and new...
3887591 Process for the production of 1-amino-4-nitroanthraquinone-2-carboxylic esters  
The production of 1-amino-4-nitroanthraquinone-2-carboxylic esters by reaction of 1,2-dihydro-6-nitro-7,8-diphthaloyl-3,1,4H-benzoxazone-4 with an alcohol in the presence of an acid catalyst. Pure...
3886188 Production of pure 1-amino-4-nitroanthraquinone-2-carboxylic acid  
An improvement in the process for the production of 1-amino-4-nitroanthraquinone-2-carboxylic acid from 1-aminoanthraquinone-2-carboxylic acid by reaction with formaldehyde in concentrated sulfuric...
3873538 AMINO-9,10-DIHYDRO-9,10-DIOXO-2-ANTHROIC ACIDS  
Anthraquinone derivatives of the general formula I : ##SPC1## and pharmaceutically acceptable salts and esters thereof, Wherein R 1 represents a halogen atom, a hydroxyl group or a group --OR 2 ,...
Matches 1 - 50 out of 106 1 2 3 >