Summary
Polymerisations of either enantiomer of commercially available methyl β-hydroxyisobutyrates 1a and 1b were carried out. Ti(OBun)4 catalysed transesterification of the neat monomer generated either polymer 3 at lower temperatures (∼100°C) or homochiral macromonomer 2 at higher temperatures. Under optimal conditions for the preparation of the macromonomer 2, a soluble material (Mn 3600, Mw 7000) was produced which displayed high crystallinity as judged by X-ray powder diffraction analysis.
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Mitra, M., O'Hagan, D. The synthesis of a homochiral methacrylate macromonomer by polymerisation of (R)- or (S)-methyl β-hydroxyisobutyrate. Polymer Bulletin 36, 311–316 (1996). https://doi.org/10.1007/BF00319230
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DOI: https://doi.org/10.1007/BF00319230