Abstract
Optically active cyclic poly(ether sulfone)s are prepared from 4-fluorophenyl sulfone and ( R)- or ( S)-1,1′-bi-2-naphthol. The measurement of MALDI-TOF MS shows that the product is composed of a series of cyclic and linear oligomers where the repeating unit number ( n) is from 2 to 12, from which the cyclic dimers ( n=2), and cyclic trimer ( n=3) have been separated from their homologous compounds by TLC successfully. Specific optical rotation [α] D 25 is −583.0 for ( R)-cyclic dimer, +588.0 for ( S)-cyclic dimer, +22.7 for ( R)-cyclic trimer, and −20.3 for ( S)-cyclic trimer. Their properties are also determined by other methods, such as 1H NMR and CD etc.
Published Version
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