13633-25-5Relevant articles and documents
Shapiro,Jenkins
, p. 771 (1969)
Novel quaternary ammonium functional addition-type norbornene copolymer as hydroxide-conductive and durable anion exchange membrane for direct methanol fuel cells
He, Xiaohui,Liu, Jingyin,Zhu, Hongyu,Zheng, Yan,Chen, Defu
, p. 63215 - 63225 (2015)
Novel quaternary ammonium functional addition-type norbornene copolymers (QCnP(BN/PhBN), n = 1, 6, 10, 12) with different alkyl side chain length comb-shaped structures or different contents of 2-(4-phenyl-butoxymethy-lene)-5-norbornene (PhBN) (22-77%) are synthesized via copolymerization of functionalized norbornenes, and their corresponding hydroxide-conductive anion exchange membranes (AEMs) with effective hydrophilic-hydrophobic separation are prepared and confirmed by TEM or SEM. The achieved AEMs show high ion exchange capacity (1.83 mmol g-1), as well as low methanol permeability (1.97-20.4 × 10-7 cm2 s-1), which are lower than that of Nafion. The ionic conductivity increases with the operation temperature increasing and is observed up to 4.14 × 10-3 S cm-1. The AEMs exhibit excellent dimensional stability with a swelling degree in plane between 0.9-3.3% and good chemical stability under 6 M NaOH solution even after a month. Membrane electrode assembly (MEA) is fabricated by using the alkalized QC12P(BN/PhBN)-77 as the AEM and tested in an alkaline direct methanol fuel cell. The open circuit voltage (OVC) of 0.54 V and the maximum current density of 66 mW cm-2 are achieved at 80 °C, respectively.
Cs2CO3 promoted O-alkylation of alcohols for the preparation of mixed alkyl carbonates
Chu,Dueno,Kyung Woon Jung
, p. 1847 - 1850 (1999)
The presence of cesium carbonate and tetrabutylammonium iodide (TBAI) facilitated efficient O-alkylation of alcohols with alkyl halides, giving rise to the exclusive formation of mixed alkyl carbonates. The cesium effect was also examined comparatively with other alkali carbonates.
Regiodivergent Conversion of Alkenes to Branched or Linear Alkylpyridines
Kim, Minseok,Shin, Sanghoon,Koo, Yejin,Jung, Sungwoo,Hong, Sungwoo
supporting information, p. 708 - 713 (2022/01/20)
Herein we report a practical protocol for the visible-light-induced regiodivergent radical hydropyridylation of unactivated alkenes using pyridinium salts. This approach provides a unified synthetic platform to control the regioselectivity of the synthesis of linear or branched C4-alkylated pyridines. A remarkable selectivity switch from the anti-Markovnikov to the Markovnikov product can be achieved by the addition of tetrabutylammonium bromide. The versatility of this protocol is further demonstrated based on the late-stage functionalization in pharmaceuticals.
Synthesis method of intermediate 1-bromo-4-phenylbutane
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Paragraph 0008; 0019; 0020; 0029, (2019/01/07)
The invention discloses a synthesis method of intermediate 1-bromo-4-phenylbutane. According to the method, 4-phenyl butanol, hydrobromic acid, POM-C3N4, melamine, phosphorous acid, ammonia water andMoO3 are taken as main raw materials, wherein the mass ratio of the 4-phenyl butanol to the hydrobromic acid is equal to 5 to 22; the molar ratio of the phosphorous acid to the ammonia water to the MoO3 is equal to 10 to 21 to 20, and the mass ratio of the C3N4 to P2Mo5 is equal to 5 to 1. According to the synthesis process provided by the invention, the 4-phenyl butanol and the hydrobromic acid are enabled to be subjected to a bromination reaction in presence of the catalyst POM-C3N4 so as to obtain the 1-bromo-4-phenylbutane. The traditional method uses concentrated sulfuric acid for bromination, so that a very serious carbonization phenomenon is caused, and the yield of brominated products is very low; after the POM-C3N4 heteroacid catalyst is adopted, the reaction is mild under the condition of reflux, and the yield is high; the obtained product is high in purity and simpler in aftertreatment.