Determination de la structure d'un produit de pyrolyse caracteristique des enchainements 3,4 dans les polyisoprenes de synthese |
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| Affiliation: | 1. Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India;2. Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, Campos dos Goytacaces, RJ, Brazil;3. School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia;4. Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245 Bialystok, Poland.;5. Department of Chemistry, Western Michigan University, Kalamazoo, MI 49008, USA;6. Institute of Chemistry of New Materials, University of Osnabrück, Barbarastraße 6, 49069 Osnabrucks, Germany;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. 416 Geological Team, Bureau of Geology and Mineral Exploration and Development of Hunan Province, Zhuzhou 412007, China;4. College of Earth Sciences, Guilin University of Technology, Guilin, Guangxi 541004, China |
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| Abstract: | The flash pyrolysis of polyisoprene, obtained by Ziegler-Natta catalysis and having a high proportion of 3,4 units, gives an isomer of dipentene which is characteristic of the particular type of growth reaction. Mass spectrometry, i.r. and PMR studies have shown that this isomer of pentene is either 1,4-dimethyl-4-vinyl cyclohexene or 2,4-dimethyl-4-vinyl cyclohexene. It may result from DielsAlder condensation between isoprene, liberated during pyrolysis, and the isopropenyl pendant group of a 3,4 unit followed by a depolymerization process of the chain. |
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