620-92-8Relevant articles and documents
Mesoporous Al-incorporated silica-pillared clay interlayer materials for catalytic hydroxyalkylation of phenol to bisphenol F
Wu, Xianzhang,Xia, Xinnian,Chen, You,Lu, Yanbing
, p. 74028 - 74038 (2016)
A series of mesoporous, Al-incorporated, silica-pillared clay (Al-SPCs) interlayer materials with different Al content were prepared in the presence of cationic surfactant by a structure-directing method. The catalysts' structure, texture, and acidic properties were determined using XRD, BET, SEM, TEM, FT-IR, NH3-TPD and Py-IR, respectively. Characterization results showed that these materials possess mesoporous structures with large specific surface areas. The incorporated Al leads to the increase and redistribution of Br?nsted and Lewis acid sites on SPC (silica-pillared clay). The Al-SPCs were used as catalysts for hydroxyalkylation of phenol to bisphenol F and gave a high product yield (95.4%) and selectivity (98.2%) to bisphenol F. Catalytic performance of the catalysts and characterization results proved that the catalytic activity of these catalysts depend on moderate acidity and the textural properties (specific surface areas), and the synergy of Br?nsted and Lewis acids is key for the hydroxyalkylation of phenol to bisphenol F. The reusability of the catalysts was studied, and they can be easily recovered and reused at least six times without significant loss of their catalytic activities. Finally, a plausible mechanistic pathway was proposed.
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Levine,Temin
, p. 85 (1957)
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Novel cyclohexylimide ionic liquid and method for catalyzing synthesis of butyl citrate and bisphenol F
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Paragraph 0010; 0013; 0021-0024, (2021/03/31)
The invention provides a novel cyclohexylimide ionic liquid and a method for catalyzing synthesis of butyl citrate and bisphenol F, and can solve the technical problem that the reaction yield needs tobe further improved when the traditional cyclohexylimide ionic liquid catalyzes synthesis of butyl citrate and bisphenol F. The novel cyclohexylimide ionic liquid is characterized by being prepared by the following method: S1, mixing and dissolving 1, 3-propane sultone and toluene, cooling the solution, adding Mn (OAc) 2 and reduced hexylimide, heating to 65 DEG C, and reacting for 12 hours; s2,filtering the reaction solution obtained in the step S1 to obtain a white precipitate, rinsing, and drying to obtain a white intermediate; s3, dissolving the intermediate in water, stirring, dropwiseadding concentrated sulfuric acid, heating to 80 DEG C, and reacting for 16 hours to obtain yellow transparent liquid, and S4, removing water from the transparent liquid by rotary evaporation, rinsing, washing and drying to obtain the novel cyclohexylimide ionic liquid.
Unusual transformation of 4-hydroxy/methoxybenzylic alcohols via C[sbnd]C ipso-substitution reaction using proton-exchanged montmorillonite as media
Chen, Dongyin,Chen, Xuan,Dong, Zezhong,Jiang, Nan,Li, Fei,Yun, Yangfang,Zhou, Yu
supporting information, (2020/11/12)
We present here proton-exchanged montmorillonite-mediated an unusual transformation of 4-hydroxy and 4-methoxybenzylic alcohols to form symmetrical benzylic ethers and diarylmethanes under mild conditions. Nuclear magnetic resonance spectroscopy and density functional theory calculations support a plausible mechanism, which includes a distinctive aromatic C[sbnd]C ipso-substitution reaction with a hydroxymethyl group as the C-based leaving group.