Title
Polymerization of optically active disubstituted acetylene monomers by Pd catalyst bearing bulky phosphine ligand
Author
Yuta Goto, Yu Miyagi, Natsuhiro Sano, Fumio Sanda
Year
2017
Journal
Journal of Polymer Science Part A: Polymer Chemistry
Abstract
Chloro- and aryl-substituted acetylene monomers having an optically active group were polymerized by a Pd catalyst [(tBu3P)PdMeCl] bearing a bulky phosphine ligand, and by MoCl5 for comparison. The corresponding disubstituted acetylene polymers with Mn's = 2000–19,500 and 6900–10,800 were obtained in 29–83% and 11–62% yields when the Pd and Mo catalysts were used, respectively. The formation of polyacetylenes, poly[(R)-1p], poly[(R)-1m], and poly[(S)-2p] were confirmed by SEC and the presence of a Raman scattering peak based on the alternating double bonds of the main chain. Pd-based poly[(R)-1m] exhibited CD signals around 350 nm assignable to a certain secondary structure, while Mo-based poly[(R)-1m] did not
Instrument
J-820
Keywords
Circular dichroism, Secondary structure, Polymers, Thermal stability, Inorganic chemistry