16156-50-6Relevant articles and documents
Synthesis and surface activity study of novel branched zwitterionic heterogemini fluorosurfactants with CF3CF2CF2C(CF3)2 group
Lin, Chao,Pan, Renming,Xing, Ping,Jiang, Biao
, p. 35 - 41 (2018)
In this work, we report a facile synthesis of four fluorinated zwitterionic heterogemini surfactants bearing branched CF3CF2CF2C(CF3)2- group with perfluoro-2-methyl-2-pentene as starting material. The surface activities of as-prepared four surfactants were found to be better than that of sodium perfluorooctanoate. Meanwhile, our fluorinated surfactants with double hydrophobic chains showed much better surface activities than the monomeric fluorinated surfactant. With the introduction of an alkyl chain, the CMC could be reduced more than 200 times to 6.30 × 10?5 mol/L, together with a surface tension of 18.66 mN/m. When a new fluorinated chain was introduced in the molecular structure, the CMC could be as low as 1.74 × 10?6 mol/L, along with a surface tension of 18.42 mN/m. When the alkyl chain length is 7, the surfactant has the same ability with the double fluorinated chain one to reduce the surface tension.
Physicochemical properties of tungstate-based room-temperature ionic liquids
Qiao, Yunxiang,Hu, Jun,Li, Huan,Hua, Li,Hu, Yu,Feng, Bo,Hou, Zhenshan
, p. F124-F129 (2010)
Tungstate-functionalized room-temperature ionic liquids (ILs), 1-alkyl-3-methylimidazolium tungstates [RMIm]2 [WO4] (R = C6H13 or C12H25), were synthesized and the IL's structure has been proved by NMR, Fourier transform IR, and elemental analysis. The physicochemical characteristics of the tungstate-based ILs have been determined by using methods of conductivity, viscosity, and cyclic voltammetry measurements, in comparison with those of the conventional ILs such as 1-hexyl-3-methylimidazolium methanesulfonate and 1-hexyl-3-methylimidazolium hexafluorophosphate. The influences of anions and the length of alkyl chain linked to the imidazolium ring on physicochemical properties of the ILs were examined in detail. All ILs owned higher conductivities and lower viscosities at higher temperatures. The strong intramolecular hydrogen bonds were found in the tungstate-based ILs. Cyclic voltammograms of the functionalized ILs illustrated that they were quite electrochemically stable. In general, the understanding of electrochemical properties of imidazolium ILs can facilitate their possible applications in electrochemistry.
Peroxopolyoxometalate-based room temperature ionic liquid as a self-separation catalyst for epoxidation of olefins
Li, Huan,Hou, Zhenshan,Qiao, Yunxiang,Feng, Bo,Hu, Yu,Wang, Xiangrui,Zhao, Xiuge
, p. 470 - 475 (2010)
A new peroxopolyoxometalate-based room temperature ionic liquid (POM-RTIL) has been synthesized and used as catalyst for efficient epoxidation of various olefins. The RTIL catalyst was found to be well dissolved in the solvent (ethyl acetate) during the reaction, while it can self-separate from the reaction media at room temperature after the reaction completed, which made the recovery and reuse of the IL catalyst convenient. The POM-RTIL catalyst can be recycled for five times without significant loss of activity.
1-Alkyl-3-methylimidazolium alkanesulfonate ionic liquids, [C nH2n+1mim][CkH 2k+1SO3]: Synthesis and physicochemical properties
Blesic, Marijana,Swadzba-Kwasny, Malgorzata,Belhocine, Tayeb,Gunaratne, H. Q. Nimal,Lopes, Jose N. Canongia,Gomes, Margarida F. Costa,Padua, Agilio A. H.,Seddon, Kenneth R.,Rebelo, Luis Paulo N.
, p. 8939 - 8948 (2009)
A set of 1-alkyl-3-methylimidazolium alkanesulfonate ionic liquids, [C nmim][CkSO3], formed by the variation of the alkyl chain lengths both in the cation and the anion (n = 1-6, 8, or 10; k = 1-4, or 6), was synthesised, with sixteen of them being novel. The ionic liquids were characterised by 1H and 13C NMR spectroscopy, and mass spectrometry. Their viscosities and densities as a function of temperature, as well as melting points and decomposition temperatures, were determined. The molecular volumes, both experimental and calculated, were found to depend linearly on the sum (n + k). the Owner Societies 2009.
Efficient synthesis of organic thioacetates in water
Olivito,Costanzo,Di Gioia,Nardi,Oliverio,Procopio
, p. 7753 - 7759 (2018)
Thioacetates as precursors of thiols are interesting starting points for synthesizing other organosulfur compounds. Herein, we propose a simple, efficient and fast method to obtain organic thioacetates using water as a solvent. Taking into account the great attention that has been paid toward environmentally friendly synthetic procedures in the past decades, we prove the role and the strength of the thioacetate anion as a nucleophile for nucleophilic displacement reactions in an aqueous medium. The reactions were carried out under pH control, to prevent the decomposition of the mesylate starting materials, using potassium carbonate as a safe and mild base. A simple work up allows products to be obtained with excellent yield and acceptable purity.
Enantiomeric synthesis of natural alkylglycerols and their antibacterial and antibiofilm activities
Fernández Montoya, Deicy J.,Contreras Jordan, Luis A.,Moreno-Murillo, Bárbara,Silva-Gómez, Edelberto,Mayorga-Wandurraga, Humberto
, p. 2544 - 2550 (2019/11/13)
Alkylglycerols (AKGs) are bioactive natural compounds that vary by alkyl chain length and degree of unsaturation, and their absolute configuration is 2S. Three AKGs (5l–5n) were synthesised in enantiomerically pure form, and were characterised for the first time together with 12 other known and naturally occurring AKGs (5a–5k, 5o). Their structures were established using 1H and 13C APT NMR with 2D-NMR, ESI-MS or HRESI-MS and optical rotation data, and they were tested for their antibacterial and antibiofilm activities. AKGs 5a–5m and 5o showed activity against five clinical isolates and P. aeruginosa ATCC 15442, with MIC values in the range of 15–125 μg/mL. In addition, at half of the MIC, most of the AKGs reduced S. aureus biofilm formation in the range of 23%–99% and P. aeruginosa ATCC 15442 biofilm formation in the range of 14%–64%. The antibiofilm activity of the AKGs assessed in this work had not previously been studied.
A preparing method of diethylamino hydroxybenzoyl hexylbenzoate
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Paragraph 0077-0079, (2020/03/28)
The present invention relates to a method for the preparation of diethylamino hydroxybenzoyl hexyl benzoate. Specifically, the present invention relates to a method for preparing diethylamino hydroxybenzoyl hexyl benzoate which is easy to manufacture and commercially available in mass production, and diethylamino hydroxybenzoyl hexyl benzoate crystalline particles prepared thereby. According to the present invention, diethylamino hydroxybenzoyl hexyl benzoate crystalline particles having excellent UV blocking effect can be obtained in a stable and high yield.COPYRIGHT KIPO 2020
Multi-Gram Scale Synthesis of 1,2,3-Triazolium Ionic Liquids and Assay of Their Resistance towards Bases
Raiguel, Stijn,Thomas, Joice,Binnemans, Koen,Dehaen, Wim
supporting information, p. 4850 - 4856 (2018/09/06)
An easily upscalable synthesis method for 1,2,3-triazolium ionic liquids is presented. Several ionic liquids were synthesized and characterized. The influence of the side chain structure on the base-stability was investigated. One example, functionalized with linear alkyl side chains, was found to exhibit excellent stability against hot concentrated NaOH solutions and Grignard reagents.
Hexyl triazabutadiene as a potent alkylating agent
Knyazeva, Diana C.,Kimani, Flora W.,Blanche, Jean-Laurent,Jewett, John C.
, p. 2700 - 2702 (2017/06/23)
Alkyl diazonium ions are among the most reactive alkylating agents in the synthetic chemists’ arsenal. That said, there are precious few methods by which one can selectively and safely utilize this chemistry. Herein, we show the use of a bench stable hexyl triazabutadiene as a source of reactive diazonium ions that undergo substitution chemistry with weak nucleophiles, such as carboxylates and even sulfonates. In the absence of a nucleophile, elimination was observed to occur. To overcome issues stemming from side-product inhibition of the reaction, we show that the triazabutadiene can be pre-activated with tosyl isocyanate.
Molybdenum oxide-mediated facile aliphatic nucleophilic fluorination
Said, Madhukar S.,Khandare, Lina,Shinde, Sandip S.
supporting information, p. 59 - 62 (2016/12/23)
A facile aliphatic nucleophilic fluorination with cesium fluoride in the presence of molybdenum oxide as a catalyst has been demonstrated. Reactivity of molybdenum oxide in nanocrystal form was found to be chemoselective in the presence of water. Furthermore, the reaction is highly specific with alkyl sulfonate substrates.
