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Isomerisation of Erythro ‐ and Threo ‐Succinyl Units in Alternating Alkene‐Maleic Acid Copolymers: A Promising Route to New Microstructures
Author(s) -
Komber Hartmut,
Steinert Volker
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400520
Subject(s) - isomerization , maleic acid , alkene , diastereomer , copolymer , aqueous solution , polymer chemistry , chemistry , tacticity , dissociation (chemistry) , organic chemistry , polymerization , catalysis , polymer
Summary: A first route to the isomerisation of erythro ‐ and threo ‐2,3‐disubstituted succinyl units in alternating alkene‐maleic acid copolymers is presented. The isomerisation reactions of the disodium salt of ethene‐maleic acid copolymer were carried out in aqueous solution at 180–240 °C in an autoclave. It is demonstrated that the erythro ‐content can be changed from 17% up to 67%. The dissociation of methine CH bonds with the intermediate formation of a sp 2 hybridised carbon is proposed as the mechanism.Isomerisation equilibrium between the threo ‐ and erythro ‐form of the 2,3‐disubstituted succinyl unit.