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• W2077847676 abstract "Isobutenyl-telechelic polyisobutylenes (PIBs) were synthesized by reacting tert-chlorine-telechelic and living PIBs with isobutenyltrimethylsilane (IBTMS) in the presence of TiCl4 in CH2Cl2/hexane (40/60 v/v) solvent mixtures at −78°C. In order to obtain PIB oligomers, living polymerization of isobutylene was induced by the di-(2-hydroxy-2-propyl)-5-tert-butylbenzene (tBuDiCumOH)/BCl3 combination in CH2Cl2 followed by addition of required amounts of hexane and TiCl4 to avoid polymer precipitation and permanent termination. Although quantitative end-quenching of living PIB was achieved with IBTMS, chain coupling between the living PIB chains and isobutenyl-ended polymers also occurred. This side reaction was avoided by isobutenylation of tert-chlorine-telechelic PIB with IBTMS in the presence of TiCl4. The resulting isobutenyl-telechelic PIB contains exclusively exoCH2C(CH3)CH2 endgroups, and is free from CHC(CH3)2 endo olefins usually obtained in small quantities (∼3–8% of total double bonds) as a side product of other methods used in the past." @default.
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• W2077847676 date "1997-05-01" @default.
• W2077847676 modified "2023-10-14" @default.
• W2077847676 title "Synthesis of isobutenyl-telechelic polyisobutylene by functionalization with isobutenyltrimethylsilane" @default.
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• W2077847676 doi "https://doi.org/10.1016/s0032-3861(96)00802-6" @default.
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