First controlled cyclopolymerization of Diethyl dipropargylmalonate by MoCl5-n-Bu4Sn-EtOH-Quinuclidine and MoOCl4-n-Bu4Sn-EtOH-quinuclidine to give highly regular polyenes consisting exclusively of 1,2-(cyclopent-1-enylene)-vinylene units
作者： Udo Anders , Martin Wagner , Oskar Nuyken , Michael R. Buchmeiser
DOI: 10.1021/MA021604L
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摘要: Diethyl dipropargylmalonate (DEDPM) was cyclopolymerized by MoCl5−n-Bu4Sn−EtOH−quinuclidine (1:1:5:1) and MoOCl4−n-Bu4Sn−EtOH−quinuclidine (1:1:2:1), respectively, to produce poly(DEDPM) exclusively based on 1,2-(cyclopent-1-enylene)vinylene units (EtOH = ethanol). The exact ratio of five- six-membered rings determined quantitative 13C NMR measurements. initiator efficiency (1:1:2:1) as high 91%, the highest value ever reported for such systems, whereas corresponding MoCl5-based ≤67%. absorption maximum λmax 587 nm. A effective conjugation length (Neff) 49 estimated therefrom. Molecular weights polydispersity indices (PDIs) polymers were in CHCl3 size exclusion chromatography (SEC) vs polystyrene (PS). Additionally, light-scattering (LS) data collected at λ 690 nm order calculate absolute molecular weights. Polydispersities ≤1.9 obt...
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