Abstract: A process is provided for preparing new mixtures of N,N-bis(2-hydroxyalkyl)-4-toluidine derivatives which can be used as polymerization accelerators.

Abstract: The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams.

Abstract: A process is provided for preparing new mixtures of N,N-bis(2-hydroxyalkyl)-4-toluidine derivatives which can be used as polymerization accelerators.

Abstract: The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams.

Abstract: The invention relates to a method for the thermal decarboxylation of dicarboxylic acids, in particular to 3,4-ethylene dioxythiophene-2,5-dicarboxylic acid as an educt. According to said method the educt is used in solid form and/or the reaction is carried out in the presence of a plurality of fluidised bed bodies. No solvents are used in the reaction and the decarboxylation product that is formed during the reaction is carried away from the reaction zone in gaseous form.

Abstract: A process is provided for preparing new mixtures of N,N-bis(2-hydroxyalkyl)-4-toluidine derivatives which can be used as polymerization accelerators.

Abstract: A process for the preparation of 2-phenylbenzimidazole-5-sulphonic acid, characterized in that 3,4-diaminobenzenesulphonic acid is reacted at a pH between 4 and 7 in aqueous solution with 0.9 to 1.5 mol of benzaldehyde per mole of 3,4-diaminobenzenesulphonic acid and with 1.0 to 3.0 mol of SO2 per mole of 3,4-diaminobenzenesulphonic acid, or an agent which comprises 1.0 to 3.0 mol of SO2 per mole of 3.4-diaminobenzenesulphonic acid, is described.

Abstract: The invention relates to substituted or unsubstituted benzodioxinothiophenes, their preparation and their use for preparing electrically conductive oligomers or polymers, also oligomers or polymers comprising these thiophene derivatives as repeating unit.

Abstract: Described herein is a process for the preparation of 3,4-diaminobenzenesulphonic acid, characterized in that 1,2-diaminobenzene is reacted with anhydrous sulphuric acid which optionally comprises SO3 in up to stoichiometric amount, at a temperature in the range from 100 to 160° C. with stirring for a reaction time of from 1 to 20 hours; water or ice is added to the reaction mixture, optionally with cooling, up to a sulphuric acid concentration in the range from 30 to 75% by weight, based on the total mixture; the 3,4-diaminobenzenesulphonic acid precipitated out of the reaction mixture is filtered off, optionally washed with dilute sulphuric acid and worked up.

Abstract: The invention relates to a process for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters or their alkali metal or alkaline earth metal salts with alkylating agents in a polar diluent in the presence of quaternary onium salts.

Abstract: Described herein is a process for the preparation of 3,4-diaminobenzenesulphonic acid, characterized in that 1,2-diaminobenzene is reacted with anhydrous sulphuric acid which optionally comprises SO3 in up to stoichiometric amount, at a temperature in the range from 100 to 160° C. with stirring for a reaction time of from 1 to 20 hours; water or ice is added to the reaction mixture, optionally with cooling, up to a sulphuric acid concentration in the range from 30 to 75% by weight, based on the total mixture; the 3,4-diaminobenzenesulphonic acid precipitated out of the reaction mixture is filtered off, optionally washed with dilute sulphuric acid and worked up.

Abstract: A process for the preparation of 2-phenylbenzimidazole-5-sulphonic acid, characterized in that 3,4-diaminobenzenesulphonic acid is reacted at a pH between 4 and 7 in aqueous solution with 0.9 to 1.5 mol of benzaldehyde per mole of 3,4-diaminobenzenesulphonic acid and with 1.0 to 3.0 mol of SO2 per mole of 3,4-diaminobenzenesulphonic acid, or an agent which comprises 1.0 to 3.0 mol of SO2 per mole of 3.4-diaminobenzenesulphonic acid, is described.

Abstract: The invention relates to a process for the alkylation of 3,4-dihydroxythiophene-2, 5-dicarboxylic esters or their alkali metal or alkaline earth metal salts with alkylating agents in a polar diluent in the presence of quaternary onium salts.

Abstract: The invention relates to substituted or unsubstituted benzodioxinothiophenes, their preparation and their use for preparing electrically conductive oligomers or polymers, also oligomers or polymers comprising these thiophene derivatives as repeating unit.

Abstract: The invention relates to a method for the production of 2,6-dichloro-5-fluoronicotinic acid by hydrolyzing 2,6-dichloro-5-fluoro-3-cyanopyridine by (a) dissolving 2,6-dichloro-5-fluoro-3-cyanopyridine at 70 to 90° C. in sulfuric acid having a concentration of 90 to 99% by weight and hydrolyzing the 2,6-dichloro-5-fluoro-3-cyanopyridine at 70 to 100° C. to the corresponding carboxamide, (b) cooling the resultant reaction mixture to a temperature in the range from 10 to 65° C., (c) metering in water until the concentration of sulfuric acid is 55 to 75% by weight (calculated relative to the sulfuric acid employed in stage (a) and the water employed in stage (c)) while keeping the temperature between 30 and 65° C. during the addition of the first quarter of the water and keeping the temperature between 50 and 80° C. during the addition of the second quarter of the water, and (d) completing hydrolysis of the resultant mixture to 2,6-dichloro-5-fluoronicotinic acid at 70 to 110° C.

Abstract: As a result of a special precipitation, it is possible to work up reaction mixtures containing 5-aminomethyl-2-chlorothiazole and bis(2-chlorothiazolyl-5-methyl)amine in an advantageous manner and to isolate bis(2-chlorothiazolyl-5-methyl)amine or its salts.

Abstract: A process for the preparation of dialkoxythiophenes and alkylene-dioxythiophenes in high purity and very good yields by decarboxylation of dialkoxythiophene-dicarboxylic acids or alkylenedioxythiophenedicarboxylic acids, respectively, in solvents that have a higher boiling point than the product and contain no nitrogen bases.

Abstract: This invention relates to a process for preparing basic organic nitrogen-containing compounds by

Abstract: A process for the preparation of dialkoxythiophenes and alkylene-dioxythiophenes in high purity and very good yields by decarboxylation of dialkoxythiophene-dicarboxylic acids or alkylenedioxythiophenedicarboxylic acids, respectively, in solvents that have a higher boiling point than the product and contain no nitrogen bases.

Abstract: Particularly pure di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalates are obtained in good yield and in a simple process by dissolving 5-nitro-isophthalic acid in a mixture of a C.sub.1 -C.sub.4 -alkyl alcohol and a solvent which is miscible or only partially miscible with water, heating in the presence of a strong acid, thus forming a second, aqueous phase, crystallizing out, after the esterification reaction has ended, the di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalate formed from the organic phase by cooling and removing the aqueous phase before or after the di-C.sub.1 -C.sub.4 -alkyl 5-nitro-isophthalate is separated off.