Abstract
Copolymerizations of structurally different chiral amino acid-based N-propargylamides, N-(tert-butoxycarbonyl)-d-alanine-N-propargylamide (DA) with either N-(tert-butoxycarbonyl)-l-valine-N-propargylamide (LV) or N-(tert-butoxycarbonyl)-l-phenylalanine-N-propargylamide (LF), were conducted with (nbd)Rh+[η6-C6H5B-(C6H5)3] as a catalyst to obtain the corresponding copolymers with moderate molecular weights in good yields. The specific rotation, CD, and UV−vis spectra showed that some of the copolymers underwent a helix−helix transition driven by temperature change. The transition of helix of poly(LV-co-DA) was much more obvious than that of poly(LF-co-DA). Poly(LV50-co-DA50) underwent a solvent-induced helix−helix transition via random coil.
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