13222-40-7Relevant academic research and scientific papers
Copolymer-Induced Intermolecular Charge Transfer: Enhancing the Activity of Metal-Free Catalysts for Oxygen Reduction
Yu, Yihuan,Zhang, Zhengping,Dai, Liming,Wang, Feng
, p. 5652 - 5657 (2019)
Breaking the electroneutrality of sp2 carbon lattice is a viable way for nanocarbon material to modulate the charge delocalization and to further alter the electrocatalytic activity. Positive charge spreadsheeting is preferable for catalyzing the oxygen reduction reaction (ORR) and other electrochemical reactions. Analogously to the case of intramolecular charge transfer by heteroatom doping, electrons in the conjugated carbon lattice can be redistributed by the intermolecular charge transfer from the nanocarbon material to the polyelectrolyte. A copolymeric electrolyte, epichlorohydrin-dimethylamine copolymer (EDC) was synthesized. The EDC-modified carbon nanotube (CNT) hybrid was subsequently fabricated by sonication treatment and served as a metal-free carbonaceous electrocatalyst with remarkable catalytic activity and stability. The resultant hybrid presents positive charge spreadsheeting on CNT as a result of the interfacial electron transfer from CNT to EDC. DFT calculations were further carried out to reveal that the enhancement of the wrapped EDC polyelectrolyte originates from the synergetic effect of the quaternary ammonium-hydroxyl covalently bonded structure. The CNT-EDC hybrid not only provides an atomically precise regulation to modulate nanocarbon materials from inactive carbonaceous materials into efficient metal-free catalysts, but it also opens new avenues to develop metal-free catalysts with well-defined and highly active sites.
Acyclic nucleotide analogues and related compounds
Holy,Dvorakova
, p. 695 - 702 (1995)
Acyclic nucleotide analogues bearing amino- and N-substituted amino groups in the side chain were prepared by alkylation of the bases with corresponding oxiranes and subsequent introduction of phosphonomethyl ether function. Novel enantiomeric synthons for the preparation of HPMP-compounds were prepared from a common intermediate and applied to syntheses of novel compounds (e.g. 8-azaguanine derivatives).
Manganese(II)/Picolinic Acid Catalyst System for Epoxidation of Olefins
Moretti, Ross A.,Du Bois,Stack, T. Daniel P.
supporting information, p. 2528 - 2531 (2016/07/06)
An in situ generated catalyst system based on Mn(CF3SO3)2, picolinic acid, and peracetic acid converts an extensive scope of olefins to their epoxides at 0 °C in 5 min, with remarkable oxidant efficiency and no evidence of radical behavior. Competition experiments indicate an electrophilic active oxidant, proposed to be a high-valent Mn = O species. Ligand exploration suggests a general ligand sphere motif contributes to effective oxidation. The method is underscored by its simplicity and use of inexpensive reagents to quickly access high value-added products.
Preparation of aminolignin from paper mill sludge and its discolouring flocculant performance
Jiang, Ling,Li, Shumian,Li, Xiaofeng,Li, Zhancai,Wang, Xiaojie
, p. 1279 - 1284 (2013/05/22)
Lignin was extracted from paper mill sludge by the process of alkali dissolving and acid precipitating. Then a new kind of aminolignin discolouring flocculant was prepared with the lignin and dimethylamine epoxypropylamine (named as epoxy amimes monomer) as the raw materials and NaOH as the catalyst. The influencing factors such as the ratio of reactants, activation time, reaction temperature and reaction time on the preparation of aminolignin were investigated so as to optimize the reaction conditions. The products were characterized by using Fourier transform infrared spectroscopy. The possibility of aminolignin as a flocculant was examined by using simulated waste water of several dyes and the results show that it has a satisfactory decolourizing ability, which can afford a new method of effectively utilizing lignin and tackling paper mill sludge. Copyright
Synthesis of 2'-aminomethyl derivatives of N-(2- (phosphonomethoxy)ethyl) nucleotide analogues as potential antiviral agents
Dvo?áková, Hana,Masojídková, Milena,Holy, Antonín,Balzarini, Jan,Andrei, Graciela,Snoeck, Robert,De Clercq, Erik
, p. 3263 - 3268 (2007/10/03)
A series of purine and pyrimidine N-(2-(phosphonomethoxy)ethyl) derivatives bearing aminomethyl, (dimethylamino)methyl, morpholinomethyl, and (trimethylammonio)methyl groups at the 2'-position were synthesized. The compounds were prepared by alkylation of the heterocyclic bases with appropriately substituted (aminoalkyl)oxiranes followed by condensation of the resulting intermediates with dialkyl ((p- tolylsulfonyl)oxy)methanephosphonate and subsequent treatment of the obtained diester with bromotrimethylsilane. 9-(3-Amino-2- (phosphonomethoxy)propyl)adenine (2a) proved active against varicella zoster virus (VZV), cytomegalovirus (CMV), and Moloney murine sarcoma virus (MSV) in the concentration range of 7-35 μg/mL. None of the other aminoalkyl derivatives demonstrated significant antiviral activity against herpes simplex virus type 1 and 2 (HSV-1 and HSV-2), VZV, (CMV), vaccinia virus (VV), MSV, and human immunodeficiency virus type 1 and 2 (HIV-1 and HIV-2).
