Preparation of some large cyclic oxyethylene succinate ether-esters

✍ Scribed by Wood, B. R.; Hamilton, S. C.; Semlyen, J. A.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 307 KB
• Volume: 44
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199711)44:3<397::aid-pi872>3.0.co;2-j

✦ Synopsis

Cyclic oligomers of tetraethyleneglycol succinate pentaethyleneglycol succinate [O(CH 2 CH 2 O) 4 . CO . CH 2 CH 2 . CO] x , and hexaethyleneglycol succinate [O(CH 2 CH 2 O) 5 . CO . CH 2 CH 2 . CO] x were prepared by dilute solution ringÈ [O(CH 2 CH 2 O) 6 . CO . CH 2 CH 2 . CO]

x chain transesteriÐcation reactions. The cyclic products were characterized by GPC, FAB mass spectrometry and NMR spectroscopy. The molar concentrations of the cyclics were determined using GPC and are compared in this paper. The cyclic ether-ester oligomers were fractionated by preparative GPC to give a series of narrow molar mass fractions with dispersities of c 1É05. The (M 1 w /M 1 n ) cyclic tetraethyleneglycol succinate monomer was crystallized and its structure determined by X-ray crystallography.