Abstract:
The present invention relates to the preparation of a key Rilpivirine intermediate namely, (E)-4-(2-cyanoethenyl)-2,6-dimethylphenylamine hydrochloride (II) by a process comprising reaction of the tetrafluoroborate salt of the diazonium ion of 2,6- dimethyl-4-amino-l-carboxybenzyl phenylamine (VI) with acrylonitrile in presence of palladium acetate, followed by treatment with an acid and its subsequent conversion to the hydrochloride salt (II), wherein the undesired Z isomer is less than 0.5% and provides Rilpivirine hydrochloride having Z isomer less than 0.1%.
Abstract:
Present invention relates to a process and an installation (100) for the preparation of hydrogen cyanide by the Andrussow process, and more precisely for improving the conditions of mixing the reactant gases before feeding the Andrussow type reactor (60), in order to improve safety, to avoid any risk of explosion and to produce HCN in safe and efficient manner. The installation is configured in such a manner that oxygen is pre-mixed with air with a ratio comprised between 20,95% and 32,5% by volume, preferably between 25% and 30,5% by volume; methane containing gas and ammonia are simultaneously added in the pre-mixture of oxygen-enriched air in such a manner that the volumic ratio of methane to ammonia is comprised between 1,35 and 1,02 depending on the content of oxygen into air; said obtained reactant gases mixture having a temperature comprised between 80°C and 120°C, preferably between 95°C and 115°C for feeding the Andrussow type reactor (60).
Abstract:
Disclosed is process for the preparation of a key Rilpivirine intermediate namely, (E)-4-(2-cyanoethenyl)-2,6-dimethylphenylamine hydrochloride (II) by a process comprising reaction of the tetrafluoroborate salt of the diazonium ion of 2,6-dimethyl-4-amino-l-carboxybenzyl phenylamine (VI) with acrylonitrile in presence of palladium acetate, followed by treatment with an acid and its subsequent conversion to the hydrochloride salt (II), wherein the undesired Z isomer is less than 0.5% and provides Rilpivirine hydrochloride having Z isomer less than 0.1%.
Abstract:
Biphenyl-4-carbonitril der Formel (I) wird durch Umsetzung von Biphenyl mit Chlorcyan in Gegenwart von wasserfreiem Aluminiumchlorid hergestellt. Das Verfahren liefert das gewünschte Produkt in guter Ausbeute und ohne Bildung von isomeren oder mehrfach cyanierten Nebenprodukten. Biphenyl-4-carbonitril ist ein wichtiges Zwischenprodukt, beispielsweise in der Synthese von pharmazeutischen Wirkstoffen.
Abstract:
The invention relates to a method for producing organic compounds of the general formula (I) R-R' (I), by reacting a corresponding compound of the general formula (II) R-X (H), where X stands for fluorine, chlorine, bromine, or iodine, forming a magnesium organic compound of the general formula (III) [M+]n [RmMgXkY1] (III), compounds of the formula (III) being reacted with a compound of the general formula (IV), characterized in that the reaction of (III) with (IV) is performed in the presence of a) catalytic quantities of an iron compound, relative to the compound of the general formula (II), and optionally in the presence b) of an additive comprising nitrogen, oxygen, and/or phosphorous in a catalytic or stoichiometric quantity relative to the compound of the general formula (II).
Abstract:
Die vorliegende Erfindung betrifft ein technisch gangbares Verfahren zur Herstellung von Alkali- und Erdalkalimetalltricyanomethaniden in einer besonders hohen Reinheit.