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Volumn , Issue 23, 2007, Pages 2351-2353

Macromolecular helicity inversion of an optically active helical poly(phenylacetylene) by chemical modification of the side groups

Author keywords

[No Author keywords available]

Indexed keywords

CHLORIDE; ESTER DERIVATIVE; HYDROXYL GROUP; ISOCYANATE; PHENYLACETYLENE; TRIACYLGLYCEROL LIPASE;

EID: 34249989774     PISSN: 13597345     EISSN: None     Source Type: Journal    
DOI: 10.1039/b701281k     Document Type: Article
Times cited : (14)

References (43)
  • 28
    • 33750884601 scopus 로고    scopus 로고
    • For more details, see electronic supplementary information (ESI) According to Kazlauskas' rule, the R-secondary alcohols are preferentially esterified during the lipase-catalyzed kinetic resolution of racemic secondary alcohols. Therefore, the absolute configurations of the optically active 1 and 2 obtained by the kinetic resolution of rac- 1 with lipase were tentatively assigned as S and R, respectively. For Kazlauskas' rule, see:
    • T. Hasegawa K. Maeda H. Ishiguro E. Yashima Polym. J. 2006 38 912
    • (2006) Polym. J. , vol.38 , pp. 912
    • Hasegawa, T.1    Maeda, K.2    Ishiguro, H.3    Yashima, E.4
  • 29
    • 0028134021 scopus 로고
    • Copolymerization results of (S)- 1 and (R)- 2 at varying monomer feed ratios ([(S)- 1]: [(R)- 2] = 1: 9, 3: 7, 5: 5, 7: 3, and 9: 1) showed that the polymerizability of (S)- 1 is almost identical to that of (R)- 2 and that the monomer distributions in the copolymer, poly((S)- 1-co-(R)- 2), are mostly random, independent of the level of monomer conversions
    • M. Cygler P. Grochulski R. J. Kazlauskas J. D. Schrag F. Bouthillier B. Rubin A. N. Serreqi A. K. Gupta J. Am. Chem. Soc. 1994 116 3180
    • (1994) J. Am. Chem. Soc. , vol.116 , pp. 3180
    • Cygler, M.1    Grochulski, P.2    Kazlauskas, R.J.3    Schrag, J.D.4    Bouthillier, F.5    Rubin, B.6    Serreqi, A.N.7    Gupta, A.K.8
  • 30
    • 34249990348 scopus 로고    scopus 로고
    • The CD and absorption spectra of all the copolymers in THF did not change after the samples had been allowed to stand at room temperature for 1 day For recent reviews, see ref 4 and
    • The CD and absorption spectra of all the copolymers in THF did not change after the samples had been allowed to stand at room temperature for 1 day
  • 39
    • 33745037692 scopus 로고    scopus 로고
    • The significant difference between the CD spectrum of the sum of the homopolymers of poly((S)- 1) and poly((R)- 2) (1: 2 = 53: 47, mol/mol) and the CD spectrum of the copolymer (poly((S)- 1-co-(R)- 2)) (1: 2 = 53: 47, mol/mol) (Fig. S4A) indicates that the poly((S)- 1-co-(R)- 2)) is not composed of the blocks of poly((S)- 1) and poly((R)- 2). A similar great difference between the CD spectrum of poly((S)- 3-co-(R)- 2) and the sum of the CD spectra of the corresponding homopolymers, poly((S)- 3) and poly((R)- 2) (Fig. S4B), also supports the random monomer distributions in the poly((S)- 3-co-(R)- 2). These results clearly revealed the inversion of the helix-sense of the poly((S)- 1-co-(R)- 2) main-chain that takes place after the chemical modification of the hydroxy groups with bulky substituents The different temperature-dependent ICD intensity changes observed for the copolymers (Fig. 2B) may be determined by cooperative interactions with neighboring monomer units;
    • K. Maeda H. Mochizuki M. Watanabe E. Yashima J. Am. Chem. Soc. 2006 128 7639
    • (2006) J. Am. Chem. Soc. , vol.128 , pp. 7639
    • Maeda, K.1    Mochizuki, H.2    Watanabe, M.3    Yashima, E.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.