Stereoselective polymerization of a racemic monomer with a racemic catalyst: Direct preparation of the polylactic acid stereocomplex from racemic lactide [7]

Journal of the American Chemical Society

Volumn 122, Issue 7, 2000, Pages 1552-1553

  Radano, Christopher P ^a   Baker, Gregory L ^a   Smith III, Milton R ^a  

^a MICHIGAN STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

MONOMER; POLYLACTIC ACID;

CATALYST; CRYSTALLIZATION; DIFFERENTIAL SCANNING CALORIMETRY; ENANTIOMER; LETTER; MELTING POINT; POLYMERIZATION; REACTION ANALYSIS; STEREOCHEMISTRY; X RAY POWDER DIFFRACTION;

EID: 0033996551     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9930519     Document Type: Letter

References (21)

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6. 5 By integration of the NMR spectrum in Figure 1a, we observe similar selectivity (∼ 90%) for isotactic placement of D- and L-lactide units.
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16. The slight deviations in chemical shifts for the resonance for the iii tetrad between our work and that reported by Thakur (δ 5.14 vs δ 5.17) likely arise from deviations in field strength between spectrometers.
17. m ≈ 150 °C) is considerably lower than we find for the stereocomplex: Wisniewski, M.; LeBorgne, A.; Spassky, N. Macromol. Chem. Phys. 1997, 198, 1227-1238.
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19. 11. 18 Peaks for the latter case are absent in Figure 2.
20. The powder pattern is available in the Supporting Information.
21. c with respect to changes in tacticity.