56570-48-0Relevant articles and documents
Synthesis and structural characterization of β-ketoiminate-stabilized gallium hydrides for chemical vapor deposition applications
Marchand, Peter,Pugh, David,Parkin, Ivan P.,Carmalt, Claire J.
, p. 10503 - 10513 (2014)
Bis-β-ketoimine ligands of the form [(CH2) n{N(H)C(Me)-CHC(Me)=O}2] (LnH2, n=2, 3 and 4) were employed in the formation of a range of gallium complexes [Ga(Ln)X] (X=Cl, Me, H), which were characterised by NMR spectroscopy, mass spectrometry and single-crystal X-ray diffraction analysis. The β-ketoimine ligands have also been used for the stabilisation of rare gallium hydride species [Ga(Ln)H] (n=2 (7); n=3 (8)), which have been structurally characterised for the first time, confirming the formation of five-coordinate, monomeric species. The stability of these hydrides has been probed through thermal analysis, revealing stability at temperatures in excess of 200C. The efficacy of all the gallium β-ketoiminate complexes as molecular precursors for the deposition of gallium oxide thin films by chemical vapour deposition (CVD) has been investigated through thermogravimetric analysis and deposition studies, with the best results being found for a bimetallic gallium methyl complex [L3{GaMe2}2] (5) and the hydride [Ga(L3)H] (8). The resulting films (F5 and F8, respectively) were amorphous as-deposited and thus were characterised primarily by XPS, EDXA and SEM techniques, which showed the formation of stoichiometric (F5) and oxygen-deficient (F8) Ga2O3 thin films.
β-Enaminones over recyclable nano-CoFe2O4: a highly efficient solvent-free green protocol
Eidi, Esmaiel,Kassaee, Mohamad Z.,Cummings, Peter T.
, p. 5787 - 5799 (2018/05/14)
Abstract: β-Enaminone and its derivatives have emerged among the finest bioactive intermediates. High yields of several β-enaminones (86–97%) are achieved through treatment of substituted aromatic and aliphatic amines with cyclic/acyclic 1,3-diketones, over the magnetically separable cobalt ferrite nanoparticles (CoFe2O4 NPs). The latter was prepared upon co-precipitation. Its purity, fine crystallinity, elemental distributions, morphology, magnetic features, and thermal stability were confirmed by Fourier transform infrared, X-ray diffraction, energy dispersive X-ray spectrometry, scanning electron microscopy, vibrating sample magnetometry, and thermal gravimetric analysis analyses. Thus, CoFe2O4 NPs acted as an excellent green heterogeneous nanocatalyst for synthesis of β-enaminones and gave good recyclability, while showing insignificant loss of their activity. Graphical Abstract: [Figure not available: see fulltext.].
Nano-SiO2 catalyzed synthesis of β-enaminones under solvent free conditions
Alinezhad, Heshmatollah,Tajbakhsh, Mahmood,Sarkati, Malihe Norouzi,Zare, Mahboobe
, p. 1591 - 1596 (2016/08/16)
Nano-SiO2 efficiently catalyzed the synthesis of β-enaminones using direct condensation of various (cyclic and acyclic) β-diketones with aromatic and aliphatic amines under solvent-free conditions. This eco-friendly catalyst can be recovered and reused without significant loss of activity. This methodology provides a simple synthetic route to enaminones in excellent yields at room temperature. Graphical abstract: [Figure not available: see fulltext.]
Fe(HSO4)3·SiO2 as an efficient, heterogeneous and recyclable catalyst for the synthesis of bis-(β-enaminones) and bis-(β-enamino esters)
Eshghi, Hossein,Safaei, Elham,Mohamad Seyedi, Seyed,Eshghi, Tahereh
, p. 1088 - 1093 (2015/02/05)
Fe(HSO4)3·SiO2 is used to catalyze the condensation of b-diketones and b-keto esters with aromatic and aliphatic diamines in solvent-free conditions at room temperature. This afforded the corresponding bis-(β-enaminones) a
A mild and efficient method for synthesis of β-enaminones using melamine-formaldehyde resin supported H+ under solvent free conditions
Rezaei, Ramin,Shakeri, Mozhdeh
, p. 7079 - 7082 (2013/08/23)
A green and efficient practical approach is developed for the synthesis of β-enaminones using melamine-formaldehyde resin supported H+ (MFRH) as a mild and inexpensive catalyst in solvent-free media. The present method was performed by combining low cost and readily available amines, 1,3-dicarbonyls and melamine-formaldehyde resin supported H+ (MFRH) as a catalyst. This method is applicable to both cyclic and acyclic ketones with aromatic and aliphatic amines, and provides several advantages such as environmental friendliness, low cost, good yields and simple workup procedure.
Influence of the structure on the antioxidant activity of tetradentate schiff bases and their copper(II) complexes: Possible mechanisms
Aburas, Najat M.,Stevanovic?, Nikola R.,Milc?ic?, Milos? K.,Lolic?, Aleksandar D.,Natic?, Maja M.,Tes?ic?, Z?ivoslav Lj.,Baos?ic?, Rada M.
, p. 1322 - 1328 (2013/09/24)
The influence of the structure on the antioxidant activity of a series of Schiff bases and their copper(II) complexes as well as possible mechanisms of antioxidant activity were investigated. Schiff bases are derived from the condensation of ethane-1,2-di
Facile synthesis of substituted pyrrole-fused isocoumarins from ninhydrin
Pathak, Sudipta,Kundu, Ashis,Pramanik, Animesh
experimental part, p. 5180 - 5183 (2011/10/12)
A simple and efficient procedure has been developed for the synthesis of substituted pyrrole-fused isocoumarins from easily available ninhydrin. The cyclic hemiaminal dihydroxy-indenopyrroles, the adducts of ninhydrin with enamines of acetylacetone, give pyrrole-fused isocoumarins upon heating in acidic medium. The process constitutes an interesting acid-catalyzed rearrangement to eight-membered lactams followed by intramolecular cyclization involving the amino and keto groups.
Silica-supported LiHSO4 as a highly efficient, heterogeneous and reusable catalytic system for the solvent-free synthesis of β-enaminones and β-enamino esters
Hasaninejad,Zare,Mohammadizadeh,Shekouhy
experimental part, p. 69 - 76 (2010/10/21)
A highly efficient, simple and green procedure for the synthesis of β-enaminones and β-enamino esters is described. The reaction of aromatic and aliphatic amines with β-dicarbonyl compounds using catalytic amount of silica-supported LiHSO4 (LiHSO4/SiO2) under solvent-free conditions at 80 °C affords the title compounds in high to excellent yields and in short reaction times.
P2O5/SiO2 as a new, efficient, and reusable catalyst for preparation of β-enaminones under solvent-free conditions
Mohammadizadeh, Mohammad R.,Hasaninejad,Bahramzadeh,Khanjarlou, Z. Sardari
experimental part, p. 1152 - 1165 (2009/10/09)
P2O5/SiO2 (30% w/w) was applied as an efficient, heterogeneous, and reusable catalyst for the synthesis of β-enaminones. The reactions were rapidly completed at 80°C under solvent-free conditions and products were obtained in good to excellent yields. Copyright Taylor & Francis Group, LLC.
Synthesis of pyrazoles, diazepines, enaminones, and enamino esters using 12-tungstophosphoric acid as a reusable catalyst in water
Chen, Xiang,She, Jin,Shang, Zhicai,Wu, Jun,Wu, Haifeng,Zhang, Peizhi
experimental part, p. 3478 - 3486 (2009/05/09)
12-Tungstophosphoric acid (H3PW12O40) is found to be an efficient and recyclable catalyst in promoting a chemo- and regioselective condensation of hydrazines/hydrazides, diamines, and primary amines with various 1,3-dicarbonyl compounds in pure water at room temperature to afford pyrazoles, diazepines, and enaminones/enamino esters, respectively, in high yields. Georg Thieme Verlag Stuttgart.
