Selectivity of Ethylaluminium Dichloride–Proton Donor Complex Catalysts from the C4 Fraction in Initiating the Oligomerization of Isobutylene

Заиков, Г. Е.; Artsis, M. I.; Андреев, Д. С.; Игнатов, А В

doi:10.1134/s1990793122040169

Cited by 2 publications

(1 citation statement)

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“…In the recent theoretical work of Zaikov et al [ 102 ], qualitatively different view on the initiation of polymerization of IB with the use of Et 2 AlCl/ROH (R = H, Ph) was proposed. The authors assumed that initiation of the IB molecule proceeds involving EtCl 2 Al … O(R)H species, and estimated the activation energies of this process at ab initio HF/3-21G level of theory.…”

Section: Three Generations Of Modern Catalystsmentioning

confidence: 99%

Polyisobutylenes with Controlled Molecular Weight and Chain-End Structure: Synthesis and Actual Applications

et al. 2023

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The polymerization of isobutylene allows us to obtain a wide spectrum of polyisobutylenes (PIBs) which differ in their molecular weight characteristics and the chemical structure of chain-end groups. The bulk of the PIBs manufactured worldwide are highly reactive polyisobutylenes (HRPIBs) with –C(Me)=CH2 end-groups and low-molecular weights (Mn < 5 kDa). HRPIBs are feedstocks that are in high demand in the manufacturing of additives for fuels and oils, adhesives, detergents, and other fine chemicals. In addition, HRPIBs and CMe2Cl-terminated PIBs are intensively studied with the aim of finding biomedical applications and for the purpose of developing new materials. Both chain control (molecular weight and dispersity) and chemoselectivity (formation of exo-olefinic or –CMe2Cl groups) should be achieved during polymerization. This review highlights the fundamental issues in the mechanisms of isobutylene polymerization and PIB analysis, examines actual catalytic approaches to PIBs, and describes recent studies on the functionalization and applications of HRPIBs and halogen-terminated PIBs.

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Section: Three Generations Of Modern Catalystsmentioning

confidence: 99%