Abstract: There is disclosed a process for coupling one or more different diazo components with resorcinol on an industrial scale. The process comprises adjusting and stabilizing the coupling pH of the resorcinol prior to the reaction with the aid of a buffer system and keeping it constant during the coupling reaction or reactions by controlling the ratio of flow of the streams of the diazo component or components and the base. The process makes it possible to prepare mono- and polyazo dyes in excellent uniform quality and yield.
Abstract: Disclosed is a process for the preparation of 1-amino-4-bromoanthraquinones by the bromination of the corresponding 1-aminoanthraquinone wherein a 1-amino-anthraquinone is contacted with elemental bromine in the presence of a carboxylic acid solvent and added hydrobromic acid. The process is not as complicated as known processes and produces lower amounts of isomeric 1-amino-2-bromoanthraquinones.
Abstract: The present invention relates to water-soluble trisazo dyes of the formula T ##STR1## and process for the preparation thereof and to the use thereof.
Type:
Grant
Filed:
August 5, 1991
Date of Patent:
May 5, 1992
Assignee:
Cassella Aktiengesellschaft
Inventors:
Wolfgang Bauer, Willi Steckelberg, Josef Ritter
Abstract: The present invention is concerned with a novel bioherbicide and its use alone or in compositions, to control the growth of Polygonum convolvulus in agricultural crops such as cereals and other cultivated crops. The present invention is also concerned with a synergistic composition of the novel bioherbicide and a chemical herbicide. Specifically, the new fungus is Phoma sp. ATCC 20982.
Type:
Grant
Filed:
February 6, 1990
Date of Patent:
January 21, 1992
Assignee:
The Royal Institution for the Advancement of Learning (McGill University)
Abstract: A method of isomerizing propargyl alcohol to acrolein, wherein propargyl alcohol is rearranged in the gas phase at a temperature of from 300.degree. to 550.degree. C. and a pressure of from 0.01 to 50 bar and in contact with a heterogeneous catalyst containing alkaline-reacting metal ions, and the use of propargyl alcohol as a depot substance for the liberation of acrolein.
Type:
Grant
Filed:
February 14, 1991
Date of Patent:
December 31, 1991
Assignee:
BASF Aktiengesellschaft
Inventors:
Werner Steck, Matthias Schwarzmann, Kurt Weinacht, Franz Merger
Abstract: The present invention relates to a process for the preparation of a N-substituted phenylenediamine of the formula: ##STR1## comprising reacting N-phenylquinoneimine of the formula: ##STR2## with a primary amine of the formula:R--NH.sub.2 (III),wherein the molar ratio of II to III in the reaction mixture ranges from about 1:1 to 1:10; and wherein R is selected from the group of radicals consisting of alkyls having 1 to 20 carbon atoms, cycloalkyls having 6 to 8 carbon atoms and radicals of the structural formula: ##STR3## wherein R.sup.2 may be the same or different and is independently selected from the group of radicals consisting of hydrogen and an alkyl having 1 carbon atom, R.sup.3 is selected from the group of radicals consisting of an alkyl having 1 to 12 carbon atoms and n is an integer of from 0 to 6. The present process is characterized by its excellent yields of high purity N-substituted phenylenediamines.