| abstract |
FIELD: chemistry. n SUBSTANCE: description is given of use of a catalyst system for (co)oligomerisation of lactide or glycolide with ring opening. The catalyst system is formed by a polymer catalyst based on a strongly acidic ion-exchange resin (1) and a (co)oligomerisation additive of formula (2) R 1 -E-R 2 , in which E is an element of the 16 th group, R 1 is a hydrogen or deuterium atom, R2 is a hydrogen or deuterium atom or a group in formula - E 14 (R 14 )(R' 14 )(R" 14 ), where E 14 is an element of the 14 th group, R 14 , R' 14 , R" 14 - represent a hydrogen atom, a deuterium atom, substituted or unsubstituted alkyl, cycloalkyl or aryl. n EFFECT: proposed catalyst system allows for controlling chain length and nature of terminal groups of compounds, separate compounds from a catalyst using a simple and efficient method and prevent loss of catalyst activity. n 14 cl, 8 ex |