Stereoregular Polymerization of Alkyl Propiolate Catalyzed by Rh Complex |
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Authors: | Masayoshi Tabata Yasuo Inaba Kazuaki Yokota Yuji Nozaki |
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Affiliation: | Faculty of Engineering Hokkaido University , Sapporo, 060, Japan |
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Abstract: | Abstract The polymerizations of alkyl esters of propiolic acid by Rh complex catalysts were investigated. [Rh(norbornadiene)Cl]2, which was the most active among the catalysts examined, gave rise to poly(alkyl propiolate) in a fairly high yield (~80%) in the presence of alcohol as the polymerization solvent. The polymers formed were a pale yellow powder soluble in common organic solvents except for poly(methyl propiolate). The structures of the polymers obtained were investigated by IR, 13C-NMR, CP MAS 13C-NMR, and laser Raman spectroscopies, together with the x-ray diffraction method. Based on these spectroscopic data, it was concluded that this Rh complex can be called a stereoregular polymerization catalyst of alkyl propiolate because the poly(alkyl propiolate) obtained has a cis-transoidal structure. |
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