Isomerisation of Erythro- and Threo-Succinyl Units in Alternating Alkene-Maleic Acid Copolymers: A Promising Route to New Microstructures
✍ Scribed by Hartmut Komber; Volker Steinert
- Book ID
- 102496321
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 94 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
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.
imageIsomerisation equilibrium between the threo‐ and erythro‐form of the 2,3‐disubstituted succinyl unit.