Abstract:
A process for the preparation of a compound or polymer having at least one functional group selected from hydroxyl, thiol, amino and carboxylic acid groups is characterized in that a compound or polymer (A) containing a group of formula (I), where Q represents O or S and X represents -O-, -S-, -NH- or a direct bond, the group being linked to the remainder of the compound or polymer through a carbon atom, is reacted with a compound (B) containing at least two functional groups selected from hydroxyl, thiol, amino and carboxylic acid groups, one of which functional groups (II) reacts with the group of formula (I) and one of which functional grops (III) is substantially unreactive with the group of formula (I) under the conditions of reaction, so that the compound (B) becomes bonded to (A) through the reaction of groups (I) and (II) forming a compound or polymer containing unreacted functional groups (III). The invention also includes dendritic polymers obtainable by the process and intermediates obtainable in the process.
Abstract:
The invention relates to a process for the preparation of cyclic imides and the uses thereof, especially as intermediates for the preparation of solvents, in particular diester solvents. More specifically, the invention relates to a process for preparing cyclic imides and derivatives thereof, especially the corresponding dicarboxylic acid diesters.
Abstract:
Die vorliegende Erfindung betrifft ein verbessertes Verfahren zur Herstellung und Isolierung von Blausäure, wobei das Verfahren die Umsetzung von Methan (z.B. Erdgas), Ammoniak und optional Sauerstoff umfasst, wobei C2-C10 Nitril-Nebenprodukte, wie Acetonitril, Acrylnitril und Propionitril, in der nachfolgenden Aufarbeitung und Isolierung von Blausäure durch eine optimierte Stoffstromführung in geeigneter Weise angereichert und effektiv aus dem Verfahren ausgeschleust werden. Somit können störende polymere Ablagerungen in der Anlage vermindert werden. Weiterhin betrifft die Erfindung ein Verfahren zur Herstellung von Methacrylsäure (MAS) und/oder Alkylmethacrylaten, insbesondere Methylmethacrylat (MMA), in einem ACH-Sulfo-Prozess unter Verwendung erfindungsgemäß hergestellter Blausäure.
Abstract:
La présente invention a pour objet un procédé de préparation d'imides ainsi que les utilisations de ceux-ci, notamment comme intermédiaires pour la préparation de solvants, en particulier de solvants diesters. Plus précisément, l'invention se rapporte à un procédé de préparation d'imides cycliques et leurs dérivés, notamment les diesters d'acides carboxyliques correspondants.
Abstract:
The invention discloses a compound of formula (I) wherein, at least one of R1, R2, R3 and R4 is -C(=O)Rn and R1, R2 R3 and R4 are H or CH3 and Rn is alkyl or alkenyl group. The alkenyl group have one or more number of double bonds either in cis form or trans form or both. In Rn, where n is 12 to 30 carbons; and pharmaceutically acceptable salt thereof. The said alkenyl groups are preferably selected from the group consisting of eicosapentaenoic acid (EPA) or DHA (docosahexaenoic acid). This invention further discloses processes for their preparation of compounds of formula I and pharmaceutical compositions that contain these compounds.
Abstract:
The invention discloses a compound of formula (I) wherein, at least one of R 1 , R 2 , R 3 and R 4 is -C(=O)R n and R 1 , R 2 R 3 and R 4 are H or CH 3 and R n is alkyl or alkenyl group. The alkenyl group have one or more number of double bonds either in cis form or trans form or both. In R n , where n is 12 to 30 carbons; and pharmaceutically acceptable salt thereof. The said alkenyl groups are preferably selected from the group consisting of eicosapentaenoic acid (EPA) or DHA (docosahexaenoic acid). This invention further discloses processes for their preparation of compounds of formula I and pharmaceutical compositions that contain these compounds.
Abstract:
A process whereby both enantiomers of optically active alpha -hydroxy- gamma -butyrolactone, which are useful as medicinal intermediates, can be conveniently produced from inexpensive and easily available materials. Optically active alpha -hydroxy- gamma -butyrolactone is produced by reacting an optically active 4-amino-2-hydroxybutanoic acid derivative with nitrous acid and cyclizing under acidic conditions. Further, (S)- alpha -hydroxy- gamma -butyrolactone is reacted with sulfonyl chloride in the presence of a base to give (S)- alpha -sulfonyloxy- gamma -butyrolactone. It is further reacted with a carboxylic acid salt to give (R)- alpha -acyloxy- gamma -butyrolactone which is then deacylated by treating with an acid or a base in an alcoholic solvent to give (R)- alpha -hydroxy- gamma -butyrolactone.
Abstract:
A process which comprises reducing a fluorobenzonitrile derivative (1) into a fluorobenzylamine derivative (2) and replacing the amino group of the derivative (2) by hydroxyl to thereby obtain a fluorobenzyl alcohol derivative (3), wherein X is halogeno, with the proviso that when m is 2 or above, X's may be the same or different from each other; and m is an integer of 0 to 4.