Patent ID: 8742034
Filing Date: 2014-06-03
Classification: C08G

Abstract:
1. A process for preparing compounds of the general formula (I) where R n is an integer of at least 1, m is an integer of at least 1, X and X A is a straight-chain or branched C Y and Y where the radicals Z are identical or different and are each oxygen, sulfur, an —NH radical or an —NCH v is an integer from I to 6, or Y can also be a radical of the general formula (V), where m, n, R by reacting compounds of the general formula (VIa) and/or (VIb) where m, n, R with a compound of the general formulae (VII), (VIII) or (IX) where R characterized in that the reaction is carried out in the presence of a Brönsted acid present in water-free form as catalyst and wherein the ratio of the compound of the general formula (VII), (VIII) or (IX) to the compound of the general formulae (VIa) and/or (VIb) is from 3:1 to 5:1, wherein the amount of the compound of the general formula (VII), (VIII) or (IX) per the ratio is based on the molar amount of end groups of the compound of the general formulae (VIa) and/or (VIb).