112-18-5Relevant academic research and scientific papers
Synthesis and properties of biodegradable cationic gemini surfactants with diester and flexible spacers
Xu, Dongqing,Ni, Xiaoyue,Zhang, Congyu,Mao, Jie,Song, Changchun
, p. 542 - 548 (2017)
A series of cationic gemini surfactants with diester and flexible spacers, namely C12-PG-C12, C14-PG-C14 and C16-PG-C16, were synthesized, purified and characterized. The surface properties and aggregation behavior of the gemini surfactants were investigated by surface tension, electrical conductivity, fluorescence and Krafft point. These gemini surfactants possess higher surface activity than the traditional monomeric surfactants. The thermodynamic parameters exhibited that the micellization was a spontaneous and exothermic process in environment. The micellization process became less favorable with the decrease of alkyl chain length and the increase of temperature. Steady-state fluorescence measurements revealed that the micropolarity and aggregation number of micelles decreased with the increase of hydrocarbon chain length. The Krafft points were taken as ?0?°C, which indicated the synthesized gemini surfactants had good water solubility. The biodegradability of the gemini surfactants were evaluated in river water using Closed Bottle tested and showed their high biodegradation ratio in the open environment due to the diester bond inserting in the flexible spacer of surfactant molecules.
Micellization of cationic gemini surfactants with various counterions and their interaction with DNA in aqueous solution
Jiang, Nan,Li, Peixun,Wang, Yilin,Wang, Jinben,Haike, Yan,Thomas, Robert K.
, p. 15385 - 15391 (2004)
The micellization of six cationic gemini surfactants with various counterions, [C12H25(CH3)2N(CH 2)6N(CH3)2C12H 25]X2, designated as C12C6C 12X2 with X = F-, Cl-, Br -, Ac-, NO3-, and 1/2SO 42- in aqueous solutions has been investigated by isothermal titration microcalorimetry (ITC) and conductivity measurements. The interaction of these surfactants with DNA in aqueous solutions has also been investigated by isothermal titration microcalorimetry. The critical micelle concentration (CMC) and the degree of micellar ionization (?±), the critical aggregation concentration (CAC), the saturation concentration (C 2) of the aggregation, and the associated thermodynamic parameters were determined. The nature of the counterion significantly affects the processes of both micellization and aggregation. The trends for aggregation basically follow the Hofmeister (lyotropic) series, but the pattern of the variation of the enthalpy of aggregation often revealed a more complex behavior. Among the counterions examined, SO42- is the most effective anion for decreasing the CMC (or CAC). Both aggregation processes are mainly entropy-driven since the values of the entropy changes multiplied by temperature are much larger than the absolute values of the enthalpy changes. The binding of micelles to DNA is strongly dominated by the positive entropy gain on release of the small counterions from the micelles and from DNA. The interaction of all of the surfactants with DNA was dependent on the DNA concentration and may be associated with each micelle interacting with more than one DNA molecule.
Chemical synthesis of silver nanowires using N,N-dimethyldodecylamine oxide
Matsune, Hideki,Kuramitsu, Yudai,Takenaka, Sakae,Kishida, Masahiro
, p. 717 - 719 (2010)
This paper describes a new approach for the synthesis of uniform silver nanowires (AgNWs) using zwitterionic amphiphile, N,N-dimethyldodecylamine oxide (DDAO). Heating of AgCl and DDAO in the presence of silver nanoparticles at 135°C for 3 h produces longer AgNWs. The DDAO serves as a source of both a reducing and capping agent in the process.
Modeling of the hydrophobic microenvironment of water-soluble molybdoenzymes in an aqueous micellar solution
Hasenaka, Yuki,Okamura, Taka-Aki,Onitsuka, Kiyotaka
, p. 12618 - 12622 (2015)
A toluene-soluble molybdenum(vi) complex containing a bulky hydrophobic substituent, (Et4N)2[MoVIO2{1,2-S2-3,6-(RCONH)2C6H2}2] (R = (4-tBuC6H4)3C), was dissolved in the hydrophobic core of a micelle in an aqueous medium and catalyzed the biomimetic reduction of an amine N-oxide by an NADH analog. The kinetic isotope effect of solvent water clearly indicates that water molecules are essential for catalysis and are involved in the rate-determining step.
PROCESS FOR CONVERTING AMIDE TO AMINE
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Page/Page column 12-22, (2021/06/11)
Provided is a process for converting an amide into an amine comprising hydrogenation of the amide at a temperature not higher than 130°C and a hydrogen pressure not higher than 50 bar in the presence of a supported heterogeneous catalyst preparable by a method comprising depositing vanadium on a supported noble metal catalyst by impregnation.
SUPPORTED HETEROGENEOUS CATALYST, PREPARATION AND USE THEREOF
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Page/Page column 12-21, (2021/06/11)
A supported heterogeneous catalyst comprises rhodium and vanadium on a support, wherein the supported heterogeneous catalyst is preparable by depositing vanadium on a supported rhodium catalyst by impregnation. A process for preparing the aforementioned catalyst and a process for converting an amide into an amine in the presence of the aforementioned catalyst are provided.
Efficient hydrogenation of aliphatic amides to amines over vanadium-modified rhodium supported catalyst
Hernandez, Willinton Y.,Kusema, Bright T.,Pennetier, Alex,Streiff, Stéphane
, (2021/08/19)
This work presents a highly efficient catalytic hydrogenation system developed for the selective transformation of tertiary N,N-dimethyldodecanamide and secondary azepan-2-one amides to the corresponding amines. Industrial hydrogenation catalysts Pd/Al2O3, Pt/Al2O3 and Rh/Al2O3 were modified with vanadium (V) or molybdenum (Mo) species as oxophilic centres. The modified catalysts were prepared by deposition of V or Mo precursor on supported catalysts via impregnation method. The catalysts were characterized by ICP-OES, XRD, XPS, H2-TPR, FTIR, CO-chemisorption, TEM, SEM-EDX and TGA. Modified Rh-V/Al2O3 catalyst displayed the best performance affording high yield and selectivity >95 % to the desired tertiary and secondary amines at moderate reaction conditions of T H2 0 sites and oxophilic Vδ+ sites in the bimetallic Rh-V/Al2O3 catalyst were determined to be beneficial for the selective dissociation of C[dbnd]O bond of the carboxamides into the desired amines.
Method for realizing N-alkylation by using alcohols as carbon source under photocatalysis
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Paragraph 0048-0056; 0058, (2021/03/13)
The invention discloses a method for realizing N-alkylation by using alcohols as a carbon source under photocatalysis, and belongs to the technical field of catalytic synthesis. Alcohol, a substrate raw material and a catalyst are placed in a reaction device, ultraviolet and/or visible light irradiation is carried out in an inert atmosphere, after the irradiation is finished, solid-liquid separation is carried out to remove the catalyst, and an N-alkylation product can be obtained through extraction, distillation and purification, wherein the substrate raw material comprises any one of an amine compound, an aromatic nitro compound or an aromatic nitrile compound, the alcohol comprises any one or more of soluble primary alcohols, and the catalyst is metal oxide/titanium dioxide or metal sulfide/titanium dioxide. The method is simple and easy to operate, can be used for efficient photocatalysis one-pot multi-step hydrogenation N-alkylation reaction, and is mild in reaction condition, high in chemical selectivity of N-alkylamine, good in catalyst stability and easy to recycle.
N-Methylation of amines and nitroarenes with methanol using heterogeneous platinum catalysts
Jamil, Md.A.R.,Touchy, Abeda S.,Rashed, Md. Nurnobi,Ting, Kah Wei,Siddiki, S.M.A. Hakim,Toyao, Takashi,Maeno, Zen,Shimizu, Ken-ichi
, p. 47 - 56 (2019/02/07)
We report herein the selective N-methylation of amines and nitroarenes with methanol under basic conditions using carbon-supported Pt nanoparticles (Pt/C) as a heterogeneous catalyst. This method is widely applicable to four types of N-methylation reactions: (1) N,N-dimethylation of aliphatic amines under N2, (2) N-monomethylation of aliphatic amines under 40 bar H2, (3) N-monomethylation of aromatic amines under N2, and (4) tandem synthesis of N-methyl anilines from nitroarenes and methanol under 2 bar H2. All these reactions under the same catalytic system showed high yields of the corresponding methylamines for a wide range of substrates, high turnover number (TON), and good catalyst reusability. Mechanistic studies suggested that the reaction proceeded via a borrowing hydrogen methodology. Kinetic results combined with density functional theory (DFT) calculations revealed that the high performance of Pt/C was ascribed to the moderate metal–hydrogen bond strength of Pt.
Cationic linear chloramine antibacterial agent and synthesis method thereof
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Paragraph 0078-0080, (2019/11/12)
The invention belongs to the technical field of synthesis and application of chloramine antibacterial agents, and provides a synthesis method of a cationic linear chloramine antibacterial agent. N-tert-butyl-chloroalkylamide II and a compound IV are used as raw materials to prepare a chloramine precursor compound III, then to be reacted with tert-butyl hypochlorite at a room temperature to preparea chloramine compound I; and the compound IV is one of a tertiary amine compound IV1 with different alkyl chains, a pyridine compound IV2 with different alkyl chains and tributyl phosphine. Accordingto the preparation method, when use of potassium cyanide is avoided, different cation structures are introduced into linear chloramine molecules to improve water solubility and improve the antibacterial activity; moreover, the structure of long alkyl chains and the chloramine structure introduced into the cation center can produce the strong synergistic antibacterial effect, and the antibacterialactivity is significantly improved compared with hydantoin like chloramine; and the theoretical basis is hopefully provided for preparation of high-efficiency cationic chloramine antibacterial materials .
