Optically active poly- and oligo(biphenyl carbonate)s as stable helical molecules

Chemistry Letters

Volumn , Issue 1, 1999, Pages 93-94

  Murakawa, Ken Ichi ^a   Furusho, Yoshio ^a   Takata, Toshikazu ^a  

^a Osaka Prefecture University   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0033239007     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.1999.93     Document Type: Article

References (25)

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18. o×t (THF, 22 μM), nm ([Δε]): 255 (-34), 238 (+12). The bisignate Cotton effects of negative first and positive second signs around 240 nm clearly show (R)-configuration of (+)-5.
19. 3: C; 76.10; H 6.01%.
20. This might be attributed to the fast propagation, because anionic ring-opening polymerization of cyclic carbonate to yield (R)-1 (R = H) with t-BuOK in THF was completed within 15 sec at -78 °C: T. Takata, J. Matsuo, and T. Endo, unpublished data. When racemic 4 was used as a monomer, soluble polymer (2) was obtained quantitatively.
21. 3, 295 K) spectrum.
22. 0.5: C, 69.89; H, 6.84%.
23. 6
24. +): Calcd m/z 2348.0810; obsd 2348.0767.
25. The CD spectra of 1mer-8mer in cyclohexane were essentially same as those in THF.