597-71-7Relevant articles and documents
A Mild, General, Metal-Free Method for Desulfurization of Thiols and Disulfides Induced by Visible-Light
Qiu, Wenting,Shi, Shuai,Li, Ruining,Lin, Xianfeng,Rao, Liangming,Sun, Zhankui
supporting information, p. 1255 - 1258 (2021/05/05)
A visible-light-induced metal-free desulfurization method for thiols and disulfides has been explored. This radical desulfurization features mild conditions, robustness, and excellent functionality compatibility. It was successfully applied not only to the desulfurization of small molecules, but also to peptides.
Solvent-Free Approaches for Preparing Dipentaerythritol from Pentaerythritol and 3,3-Bis(hydroxymethyl)oxetane
Landart, Mélissa,Collas, Franck,Lemaire, Marc,Métay, Estelle
supporting information, p. 2490 - 2501 (2021/10/25)
Solvent-free synthesis of dipentaerythritol (DPE) from pentaerythritol (PE) and 3,3-bis(hydroxymethyl)oxetane (BHMO) was studied. DPE is known to be an attractive raw material in lubricating and coating fields. Reactivity of PE with BHMO was considered under acidic and basic conditions. After optimization of the reaction parameters, best yields of DPE were obtained using a Lewis acid catalyst (aluminum triflate) (33%) and using a basic catalyst (potassium hydroxide) (31%).
Synthesis of dipentaerythritol from pentaerythritol under acidic conditions
Landart, Mélissa,Lemaire, Marc,Métay, Estelle
supporting information, p. 2591 - 2603 (2020/12/29)
The direct synthesis of dipentaerythritol (DPE) from pentaerythritol (PE) was studied under acidic conditions. After optimization of the reaction parameters in a batch reactor, DPE was obtained with 50% selectivity when 50% PE was converted. This process, using PE in suspension in sulfolane (PE/sulfolane ratio = 2333 g/L) at 175 °C for 60 min, required a low amount of sulfuric acid (0.5 mol %). The optimized conditions were transposed to a 140 grams scale process. Finally, DPE was isolated with 16% yield (72% gas chromatography, GC purity) for 28% conversion of PE that corresponds to 57% DPE selectivity.
Retention Indices and Sorption Enthalpies of Pentaerythritol and С2–С8 Acid Esters on Nonpolar Stationary Phases
Emel’yanov, V. V.,Krasnykh, E. L.,Portnova, S. V.
, p. 2168 - 2176 (2020/10/08)
Abstract: The retention and sorption enthalpy characteristics of 38 pentaerythritol esters of C2–C8 carboxylic acids of different structures were determined by gas-liquid chromatography on a nonpolar phase in the temperature range 433.2–563.2 K. The molecular structure was shown to affect the temperature dependence of the retention indices of the esters. The average change in the sorption enthalpy of pentaerythritol tetraesters per CH2 group is lower in magnitude than the similar contribution for normal alkanes. The excess mixing enthalpy at 298.2 K was evaluated for four fully substituted pentaerythritol esters.
Folding control of a non-natural glycopeptide using saccharide-coded structural information for polypeptides
Fujii, Naoka,Haino, Takeharu,Ishido, Yuki,Kanbayashi, Naoya,Okamura, Taka-Aki,Onitsuka, Kiyotaka
supporting information, p. 2767 - 2770 (2020/03/13)
We synthesized "glyco-arylopeptides", whose folding structure significantly changes depending on the kind of saccharide in their side chain. The saccharide moiety interacts with the main chain via hydrogen bonding, and the non-natural polypeptides form two well-defined architectures - (P)-31- and (M)-41-helices - depending on the length of the saccharide chains and even the configuration of a single stereo-genic center in the epimers.
Desulfurization method of organic compounds containing mercapto or disulfide bond
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Paragraph 0026, (2019/10/01)
The invention relates to a desulfurization method of organic compounds, in particular, organic compounds containing mercapto or a disulfide bond. The method comprises following steps: dissolving organic compounds containing mercapto or a disulfide bond by a solvent; adding a phosphine reagent and an initiator; and carrying out reactions in the presence of light to convert the substrate into corresponding desulfurization products. The organic compounds containing mercapto or a disulfide bond is R-SH or R-S-S-R; wherein R represents a primary carbon group, a secondary carbon group, a tertiary carbon group, an aryl group, or an acyl group. The reactions do not need any metal, and the reaction conditions are mild. Moreover, the desulfurization method has the advantages of high yield, wide substrate application range, and multiple suitable solvents, and is widely suitable for multiple kinds of mercapto-removing reactions and desulfurization reactions of disulfide.
METHOD FOR PRODUCING ESTER BY USING 4-METHYLTETRAHYDROFURAN AS SOLVENT
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Paragraph 0032; 0033; 0034; 0035, (2016/10/08)
PROBLEM TO BE SOLVED: To provide a method for producing an ester which is higher in safety and can be applied to a highly polar reaction raw material or the like. SOLUTION: There is provided a method for producing an ester by reacting an alcohol and a carboxylic acid in 4-methyltetrahydropyran. By using 4-methyltetrahydropyran as a reaction solvent, an ester can be produced more safely and the method is applicable to a highly polar reaction raw material. COPYRIGHT: (C)2015,JPOandINPIT
Al(OTf)3 as a highly efficient catalyst for the rapid acetylation of alcohols, phenols and thiophenols under solvent-free conditions
Kamal, Ahmed,Khan, M. Naseer A.,Reddy, K. Srinivasa,Srikanth,Krishnaji
, p. 3813 - 3818 (2008/02/06)
Aluminium triflate (0.01-0.1 mol %) was found to be an efficient catalyst for the acylation of alcohols, phenols, thiols and sugars with acetic anhydride in high yields under solvent-free conditions in a short reaction time at room temperature. Racemization of optically active alcohols and epimerization of sugars were not observed. The acylation efficacy of various acyl donors was also investigated.
Aluminium dodecatungstophosphate (AlPW12O40) as a highly efficient catalyst for the selective acetylation of -OH, -SH and -NH2 functional groups in the absence of solvent at room temperature
Firouzabadi, Habib,Iranpoor, Nasser,Nowrouzi, Farhad,Amani, Kamal
, p. 764 - 765 (2007/10/03)
AlPW12O40 was found to be an effective catalyst for the selective acetylation of alcohols, thiols, and amines in the absence of solvent at room temperature.
