18705-39-0Relevant articles and documents
Cycloaddition of CO2 to epoxides using di-nuclear transition metal complexes as catalysts
Wani, Mohmmad Y.,Kumar, Santosh,Arranja, Claudia T.,Dias, Carlos M. F.,Sobral, Abilio J. F. N.
, p. 4974 - 4980 (2016)
Studies on the reaction and conversion of CO2 to valuable products have made much progress in recent years, and the search for efficient catalysts is also expanding. Cycloaddition of CO2 to epoxides was carried out selectively using di-nuclear CuII, CoII and NiII complexes (C1, C2 and C3, respectively) as catalysts. The complexes were synthesized in good yield and characterized by various physical and spectroscopic methods. In all complexes the ligand L acted as a bidentate NO donor favouring distorted octahedral, tetrahedral or square planar geometry for C1, C2 and C3, respectively. Complex C2 in the presence of n-Bu4NI as a cocatalyst showed the highest activity among the reported complexes in the cycloaddition reaction.
Adhesive functionalized ascorbic acid on CoFe2O4: A core-shell nanomagnetic heterostructure for the synthesis of aldoximes and amines
Sorkhabi, Serve,Ghadermazi, Mohammad,Mozafari, Roya
, p. 41336 - 41352 (2020/11/30)
This paper reports on the simple synthesis of novel green magnetic nanoparticles (MNPs) with effective catalytic properties and reusability. These heterogeneous nanocatalysts were prepared by the anchoring of Co and V on the surface of CoFe2O4 nanoparticles coated with ascorbic acid (AA) as a green linker. The prepared nanocatalysts have been identified by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray atomic mapping, thermogravimetric analysis, X-ray powder diffraction, vibrating sample magnetometer analysis, coupled plasma optical emission spectrometry and Fourier transform infrared spectroscopy. The impact of CoFe2O4@AA-M (Co, V) was carefully examined for NH2OH·HCl oximation of aldehyde derivatives first and then for the reduction of diverse nitro compounds with sodium borohydride (NaBH4) to the corresponding amines under green conditions. The catalytic efficiency of magnetic CoFe2O4@AA-M (Co, V) nanocatalysts was investigated in production of different aldoximes and amines with high turnover numbers (TON) and turnover frequencies (TOF) through oximation and reduction reactions respectively. Furthermore, the developed environment-friendly method offers a number of advantages such as high turnover frequency, mild reaction conditions, high activity, simple procedure, low cost and easy isolation of the products from the reaction mixture by an external magnetic field and the catalyst can be reused for several consecutive runs without any remarkable decrease in catalytic efficiency.
Cascade Process for Direct Transformation of Aldehydes (RCHO) to Nitriles (RCN) Using Inorganic Reagents NH2OH/Na2CO3/SO2F2 in DMSO
Fang, Wan-Yin,Qin, Hua-Li
, p. 5803 - 5812 (2019/05/14)
A simple, mild, and practical process for direct conversion of aldehydes to nitriles was developed feathering a wide substrate scope and great functional group tolerability (52 examples, over 90% yield in most cases) using inorganic reagents (NH2OH/Na2CO3/SO2F2) in DMSO. This method allows for transformations of readily available, inexpensive, and abundant aldehydes to highly valuable nitriles in a pot, atom, and step-economical manner without transition metals. This protocol will serve as a robust tool for the installation of cyano-moieties to complicated molecules.
Utilization of ultrasonic irradiation as green and effective one-pot protocol to prepare a novel series of bis-2-amino-1, 3, 4-oxa(thia)diazoles and bis-tetrazoles
Arafa, Wael Abdelgayed Ahmed,Abdel-Magied, Ahmed Fawzy
, p. 327 - 340 (2017/12/06)
In an effective and straightforward conversion, bis-semicarbazones and bis-thiosemicarbazones are transformed into a diversity of novel substituted bis-2-amino-1, 3, 4-oxadiazoles and bis-2-amino-1, 3, 4-thiadiazoles, respectively under ultrasonic irradiation. Bis-tetrazoles are obtained from the dialdehydes by sequential reaction with hydroxylamine hydrochloride, phosphorus pentoxide and sodium azide without isolation of the intermediates oximes and nitriles. All the reactions proceed cleanly and smoothly under mild conditions, with short reaction times and broad functional groups possibility. No side reactions were observed.
Synthesis and photo-alignment properties of novel polymer with terephthalaldehyde
Lee, Sang Wook,Lim, Jin Youb,Park, Sang Yong,Kim, Hyun Kyung,Shin, Dong Myung
, p. 8819 - 8822 (2016/07/27)
To improve irradiation time and the effectiveness photo-alignment, dual decomposition mechanisms including photo and thermal were investigated. For more aggressive photo-decomposition of the polymer, the photoreactions employing triplet mechanism and the
Synthesis of soluble core cross-linked polystyrene star polymer by application of acrylate-nitrile oxide 'click chemistry' using metal-free reagents
Banerjee, Rakesh,Maiti, Saikat,Dhara, Dibakar
, p. 1365 - 1373 (2014/03/21)
In the present work, we have established a novel and environmentally benign method, whereby a 1,3-dipolar cycloaddition reaction has been applied using a non-toxic reagent, iodosobenzenediacetate [PhI(OAc)2], instead of the conventional copper-based reagents for the development of star-branched polymers. Here we have demonstrated the synthesis of core cross-linked star (CCS) polymers via the formation of isoxazoline ring using 'click reaction' between acrylate functionalities in a polymer chain and in situ generated nitrile oxide groups from a cross-linker added externally. In the initial step, a well-defined styrenic block copolymer with acrylate-functionalized middle-block was synthesized by controlled radical polymerization (RAFT) using α,α′-xylyl-bis(dithiobenzoate) as a chain transfer agent using 4-vinyl benzyl chloride and styrene as comonomers. Thereafter, the chlorobenzyl groups were converted into acrylate by reaction with acrylic acid. In the following step, core cross-linked star (CCS) polymers were synthesized by reacting the above block copolymer and oxime-functionalized cross-linkers (bi- and tetra-functional) using PhI(OAc)2 'click chemistry'. Formation of CCS polymers was confirmed from NMR, FTIR, GPC and DLS studies.
One-pot synthesis of precise polyisoxazoles by click polymerization: Copper (I)-catalyzed 1,3-dipolar cycloaddition of nitrile oxides with alkynes
Li, Yan,Cheng, Bin
, p. 1645 - 1650 (2013/08/25)
This article reports a new one-pot method for polymer preparation, which involves double click chemistry. In one pot, two click reactions take place sequentially by adding the reactants step by step. The first click reaction is to produce the monomer for
Preparation of novel Di-isoxazolines using bis(nitrile oxide) 1,3-dipolar cycloaddition methodology
Bigdeli, Mohammad Ali,Halimehjani, Azim Ziyaei,Mohammadipour, Mohammad,Sagharichi, Parishad
, p. 926 - 928 (2012/10/29)
A general method for the synthesis of novel di-isoxazolines through a 1,3-dipolar cycloaddition reaction of in situ prepared bis (nitrile oxides) of terephthaldehyde and various olefins is described. The reactions are regiospecific and give high yields of
A versatile and green mechanochemical route for aldehyde-oxime conversions
Aakeroey, Christer B.,Sinha, Abhijeet S.,Epa, Kanishka N.,Spartz, Christine L.,Desper, John
supporting information, p. 11289 - 11291,3 (2012/12/12)
A robust, facile and solvent-free mechanochemical path for aldehyde-oxime transformations using hydroxylamine and NaOH is explored; the method is suitable for aromatic and aliphatic aldehydes decorated with a range of substituents. This journal is
Synthesis, characterization, antiamoebic activity and toxicity of novel bisdioxazole derivatives
Iqbal, Prince Firdoos,Parveen, Humaira,Bhat, Abdul Roouf,Hayat, Faisal,Azam, Amir
experimental part, p. 4747 - 4751 (2009/12/26)
Cyclization of benzene-1,4-dicarbaldehyde dioxime 1 with different aromatic aldehydes in inert atmosphere yielded the corresponding new bisdioxazoles 2-11. The structure of 2-11 was elucidated by spectral data. In vitro antiamoebic activity was performed
