Cationic Polymerization of 5-Methyl-2, 3-dihydrofuran
5-Methyl-2, 3-dihydrofuran(MDHF) was polymerized in toluene at low temperature by organometallic compounds(e.g. Al(C2Hs)2Ci), and the microstructure of high polymer obtained was studied by NMR. The methyl ethyl ketone-insoluble part in the polymer has not been obtained in the crystalline state till...
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| Veröffentlicht in: | Nippon Kagakukai shi (1972) 1973, Vol.1973 (3), p.610-617 |
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| container_title | Nippon Kagakukai shi (1972) |
| container_volume | 1973 |
| creator | KAMO, Bunzo SUZUKI, Nobuharu OGAWA, Koji FURUSAWA, Shijo |
| description | 5-Methyl-2, 3-dihydrofuran(MDHF) was polymerized in toluene at low temperature by organometallic compounds(e.g. Al(C2Hs)2Ci), and the microstructure of high polymer obtained was studied by NMR. The methyl ethyl ketone-insoluble part in the polymer has not been obtained in the crystalline state till now, .but was found to be stereospecific. A triplet due to a-methyl protons with different chemical configurations may be assigned to di-isotactic, heterotactic, and di-syndiotactic with increasing magnetic field. A neariy linear relationship between the Qptical density ratio D1372/D1360 in polymer and the di-syndiotacticity was observed, The conditiQns for obtaining poly-MDHF with high stereospeificity using Ziegler cataiysr are discussed. The poiymerizatipn in the presence of asymmetric cationic catalysts ffom Al(C2Hs)2Cl apd P-phenyialanine led to polymerS having optical activity. The optidalactivity shown by the polymer indicates the presence of chains an erythro-di-isotactic structure. |
| doi_str_mv | 10.1246/nikkashi.1973.610 |
| format | Article |
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The methyl ethyl ketone-insoluble part in the polymer has not been obtained in the crystalline state till now, .but was found to be stereospecific. A triplet due to a-methyl protons with different chemical configurations may be assigned to di-isotactic, heterotactic, and di-syndiotactic with increasing magnetic field. A neariy linear relationship between the Qptical density ratio D1372/D1360 in polymer and the di-syndiotacticity was observed, The conditiQns for obtaining poly-MDHF with high stereospeificity using Ziegler cataiysr are discussed. The poiymerizatipn in the presence of asymmetric cationic catalysts ffom Al(C2Hs)2Cl apd P-phenyialanine led to polymerS having optical activity. 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| language | eng |
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| title | Cationic Polymerization of 5-Methyl-2, 3-dihydrofuran |
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