Cationic polymerization of hydrocarbon monomers induced by complexes of acyl halides with Lewis acids |
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Authors: | V B Murachev A I Nesmelov E A Ezhova V S Byrikhin A V Orlinkov I S Akhrem |
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Institution: | (1) M. V. Lomonosov Moscow State Academy of Fine Chemical Technology, 86 prosp. Vernadskogo, 117571 Moscow, Russian Federation;(2) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation |
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Abstract: | The ionic complex of mesitoyl bromide with aluminum bromide in a 1∶1 composition (Mst-1) does not initiate the isobutylene
polymerization inn-hexane or methylene dichloride at −78 °C. The corresponding ionic complex of the 1∶2 composition (Mst-2) acts as a cationogenic
initiator of the polymerization. The addition of excess Lewis acid or introduction of organic electron acceptors increases
the initiating activity of the Mst-1 complex and activates acyl complexes of the 1∶2 composition including Mst-2. The results
are discussed in terms of the effect of specific solvation on the nucleophilicity of counteranions, which makes the addition
of the monomer to the carbocation possible.
For Part 9, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 52–56, January, 1998. |
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Keywords: | isobutylene cationic polymerization Lewis acids initiation polyisobutylene molecular weight end groups |
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