Phenols/Al(C6F5)3 Initiation Systems for Cationic Polymerizations of Isobutylene

Cai, Ling; Wang, Qiyuan; Liu, Xinli; Cui, Dongmei

doi:10.1007/s10118-022-2828-8

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…When phenols ( Scheme 13 ) were used in combination with Al(C 6 F 5 ) 3 in IB polymerization in toluene, medium-MW PIBs were obtained [ 125 ]. The best results were sterically achieved with hindered 2,6-di- tert -butyl-4-methylphenol (BHT) and 3,5-bis(trifluoromethyl)phenol ( Table 6 ).…”

Section: Other Catalysts and Methodsmentioning

confidence: 99%

“…Table6. Cationic polymerization of IB with the binary systems phenols/Al(C6F5)3 in toluene at −20 °C [125]. 1 .…”

mentioning

confidence: 99%

“…Scheme 13. Structures of phenols studied in cationic polymerization of IB initiated by phenols/Al(C 6 F 5 ) 3 systems[125]. Molecular structures of the phenols are indicated by the numbers used in Table6for comparison of the catalysts.…”

mentioning

confidence: 99%

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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: Other Catalysts and Methodsmentioning

confidence: 99%

“…Table6. Cationic polymerization of IB with the binary systems phenols/Al(C6F5)3 in toluene at −20 °C [125]. 1 .…”

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confidence: 99%

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

et al. 2023

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Regioselective Ring‐Opening of Oxetanes Catalyzed by Lewis Superacid Al(C₆F₅)₃

Bellido,

Riego‐Mejías,

Sciortino

et al. 2024

Adv Synth Catal

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This study details an aluminum‐catalyzed regioselective isomerization of 2,2‐disubstituted oxetanes to yield homoallylic alcohols. The reaction takes place in toluene at 40 ºC, employing 1 mol % of Al(C6F5)3 as catalyst. This catalytic system shows a wide substrate scope (12 examples). The optimized conditions are especially useful for electron‐rich aryl oxetanes, completely suppressing the formation of allyl isomers and reducing the amount of the dimer by‐product. The synthetic applicability of the reported methodology is demonstrated by the enantioselective formal synthesis of curcuquinone and the σ1 receptor agonist RC‐33.

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Phenols/Al(C6F5)3 Initiation Systems for Cationic Polymerizations of Isobutylene

Cited by 2 publications

References 35 publications

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

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

Regioselective Ring‐Opening of Oxetanes Catalyzed by Lewis Superacid Al(C₆F₅)₃

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Phenols/Al(C6F5)3 Initiation Systems for Cationic Polymerizations of Isobutylene

Cited by 2 publications

References 35 publications

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

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

Regioselective Ring‐Opening of Oxetanes Catalyzed by Lewis Superacid Al(C6F5)3

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Regioselective Ring‐Opening of Oxetanes Catalyzed by Lewis Superacid Al(C₆F₅)₃