Abstract:
The present invention relates to a process for the alkoxylation of a first polymer comprising at least one monomer unit having NH groups and optionally NH2 groups, wherein the first polymer has a molecular weight Mw of at least 500 g/mol, comprising the steps of (a) reacting the first polymer with alkylene oxide in a reaction mixture comprising a solvent until the average degree of alkoxylation of each NH group and each optional NH2 group, calculated as two NH groups, is from 0.75 to 1.25; (b) adding a second polymer of formula (I), wherein R is a linear or branched alkyl group having from 1 to 20 carbon atoms, each R' is independently a linear or branched alkyl group having from 1 to 20 carbon atoms or hydrogen, each n is independently from 1 to 5 and m is from 5 to 40, to the reaction mixture of step (a); (c) at least partially removing the solvent from the reaction mixture of step (b); and (d) further reacting the reaction mixture of step (c) with alkylene oxide at a given temperature until the average degree of alkoxylation of each NH group and each optional NH2 group, calculated as two NH groups, of the first polymer is from 2 to 40. The present invention also relates to a polymer composition obtainable from that process and the use of such a polymer composition.
Abstract:
Die vorliegende Erfindung betrifft Polyether, erhältlich aus 1-Butenoxid und einem Alkohol unter Verwendung einer Doppelmetallcyanid-Verbindung als Katalysator, wobei der Gehalt des Polyethers an ungesättigten Komponenten 6 oder mehr Mol-% beträgt, ein Verfahren zur Herstellung eines derartigen Polyethers sowie die Verwendung eines erfindungsgemässen Polyethers als Trägeröl oder in einer Trägerölformulierung, insbesondere in Additivpaketen für Otto-Kraftstoffe, und darüber hinaus auch Trägerölformulierungen sowie Kraftstoffe umfassend einen erfindungsgemässen Polyether.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Umsetzung von Epoxiden mit einer Starter-Verbindung in Gegenwart einer Doppelmetallcyanid-Verbindung als Katalysator mit verkürzter Induktionsperiode, wobei die Aktivierung der Doppelmetallcyanid-Verbindung durch Zugabe des Epoxids zu einem Gemisch aus Doppelmetallcyanid-Verbindung und Starterverbindung bei einem Reaktorinnendruck von kleiner als 1 bar erfolgt, sowie die durch ein derartiges Verfahren erhältlichen Polyether selbst.
Abstract:
O-acyl-protected glycosylamines, in particular 2,3,4,6-tetra-O-pivaloyl-beta-D-galactopyranosylamine (1), their preparation and their use for the diastereoselective synthesis of alpha-aminoacids. With compounds such as (1), one can obtain by Strecker synthesis high yields and high diastereomer surplus. The direction of the asymmetric induction can be determined by the selection of the solvent. This type of synthesis is particularly effective when carried with Lewis acid catalysts. One obtains also high yields and high diastereoselectivity during Ugi four component synthesis facilitated by Lewis acids by using amines such as (1).
Abstract:
The present invention relates to a process for the alkoxylation of a first polymer comprising at least one monomer unit having NH groups and optionally NH 2 groups, wherein the first polymer has a molecular weight M w of at least 500 g/mol, comprising the steps of (a) reacting the first polymer with alkylene oxide in a reaction mixture comprising a solvent until the average degree of alkoxylation of each NH group and each optional NH 2 group, calculated as two NH groups, is from 0.75 to 1.25; (b) adding a second polymer of formula (I), wherein R is a linear or branched alkyl group having from 1 to 20 carbon atoms, each R' is independently a linear or branched alkyl group having from 1 to 20 carbon atoms or hydrogen, each n is independently from 1 to 5 and m is from 5 to 40, to the reaction mixture of step (a); (c) at least partially removing the solvent from the reaction mixture of step (b); and (d) further reacting the reaction mixture of step (c) with alkylene oxide at a given temperature until the average degree of alkoxylation of each NH group and each optional NH 2 group, calculated as two NH groups, of the first polymer is from 2 to 40. The present invention also relates to a polymer composition obtainable from that process and the use of such a polymer composition.