106129-86-6Relevant articles and documents
A new family of 1D exchange biased heterometal single-molecule magnets: Observation of pronounced quantum tunneling steps in the hysteresis loops of quasi-linear {Mn2Ni3} clusters
Das, Animesh,Gieb, Klaus,Krupskaya, Yulia,Demeshko, Serhiy,Dechert, Sebastian,Klingeler, Ruediger,Kataev, Vladislav,Buechner, Bernd,Mueller, Paul,Meyer, Franc
, p. 3433 - 3443 (2011)
First members of a new family of heterometallic Mn/Ni complexes [Mn 2Ni3X2L4(LH)2(H 2O)2] (X = Cl: 1; X = Br: 2) with the new ligand 2-{3-(2-hydroxyphenyl)-1H-pyrazol-1-yl}ethanol (H2L) have been synthesized, and single crystals obtained from CH2Cl2 solutions have been characterized crystallographically. The molecular structures feature a quasi-linear MnIII-NiII-NiII-Ni II-MnIII core with six-coordinate metal ions, where elongated axes of all the distorted octahedral coordination polyhedra are aligned parallel and are fixed with respect to each other by intramolecular hydrogen bonds. 1 and 2 exhibit quite strong ferromagnetic exchange interactions throughout (JMn-Ni ≈ 40 K (1) or 42 K (2); JNi-Ni ≈ 22 K (1) or 18 K (2)) that lead to an Stot = 7 ground state, and a sizable uniaxial magnetoanisotropy with Dmol values -0.55 K (1) and -0.45 K (2). These values are directly derived also from frequency- and temperature-dependent high-field EPR spectra. Slow relaxation of the magnetization at low temperatures and single-molecule magnet (SMM) behavior are evident from frequency-dependent peaks in the out-of-phase ac susceptibilities and magnetization versus dc field measurements, with significant energy barriers to spin reversal Ueff = 27 K (1) and 22 K (2). Pronounced quantum tunnelling steps are observed in the hysteresis loops of the temperature- and scan rate-dependent magnetization data, but with the first relaxation step shifted above (1) or below (2) the zero crossing of the magnetic field, despite the very similar molecular structures. The different behavior of 1 and 2 is interpreted in terms of antiferromagnetic (1) or ferromagnetic (2) intermolecular interactions, which are discussed in view of the subtle differences of intermolecular contacts within the crystal lattice.
Chromenone-rhodamine conjugate for naked eye detection of Al3+ and Hg2+ ions in semi aqueous medium
Mondal, Subhendu,Bandyopadhyay, Chandrakanta,Ghosh, Kumaresh
, p. 1 - 8 (2019)
Chromenone-rhodamine conjugate 1 has been synthesized and its metal ion binding properties have been studied in CH3CN/water (3:1, v/v; 10?mM HEPES buffer; pH?=?6.85). Compound 1 senses multiple metal ions such as Al3+ and Hg2+/
A Convenient and Practical Synthesis of Aminopyrazoles
Mitchell, David,Luo, Yumei,Mcnulty, Lu Anne M.,Buser, Jonas Y.,Mcfarland, Adam D.
, p. 235 - 241 (2015)
A selective methodology for preparing highly substituted aminopyrazoles has been demonstrated. Starting with an acetophenol core, the corresponding substituted isoxazole is prepared in two steps. The isoxazole is transformed into a benzopyran. Alkylation
2-Azolylchromone derivatives as potent and selective inhibitors of monoamine oxidases A and B
Takao, Koichi,Saito, Takayuki,Chikuda, Daisuke,Sugita, Yoshiaki
, p. 1499 - 1504 (2016)
A series of 2-azolylchromone derivatives were synthesized and their monoamine oxidase (MAO) A and B inhibitory activities were evaluated. Of the synthesized compounds, compounds 1b, 2b, 4a-c, 5b and 7b showed potent inhibitory activities against MAO-A (IC50 values, 1b: 0.32 μM; 2b: 0.14 μM; 4a: 0.11 μM; 4b: 0.023 μM; 4c: 0.15 μM; 5b: 0.59 μM; 7b: 0.19 μM) and 4a, c, 5a, c, 6c and 8c for MAO-B (IC50 values, 4a: 0.028 μM; 4c: 0.019 μM; 5a: 0.73 μM; 5c: 0.28 μM; 6c: 0.28 μM; 8c: 0.27 μM). These data suggest that 6-methoxy substitution favors MAO-A inhibition and 7-methoxy substitution favors MAO-B inhibition. In addition, compound 4b was the most potent inhibitor for MAO-A, and compound 4c for MAO-B. This is the first report identifying 2-azolylchromone derivatives as potent monoamine oxidase inhibitors. These results suggest that the 2-triazolylchromone structure may be a useful scaffold for the design and development of novel monoamine oxidase inhibitors, as evidenced by the activities of 4a-c and 5a-c.
Visible Light-Promoted Selenylation/Cyclization of Enaminones toward the Formation of 3-Selanyl-4H-Chromen-4-Ones
Liu, Hao-Yang,Zhang, Jia-Rong,Huang, Guo-Bao,Zhou, Yi-Huan,Chen, Yan-Yan,Xu, Yan-Li
, p. 1656 - 1661 (2021)
A simple and efficient visible-light-promoted selenylation/cyclization of enaminones have been realized for the practical synthesis of 3-selanyl-4H-chromen-4-ones. This reaction is performed in the mild conditions, no transition metal catalyst or photocatalysts and no additional oxidants are required. In addition, the 3-selanyl-4H-chromen-4-ones could be easily converted to selanyl-functionalized pyrimidines by reacting with benzamidine substrates. (Figure presented.).
Synthesis of 3-thiophenchromone by stille cross-coupling palladium on charcoal-catalyzed ligand-free
Yang, Qian,Zhang, Zunting,Liang, Bo
, p. 310 - 316 (2015)
A new concise, facile, and efficient method for synthesis of 3-thiophenchromone was accomplished in more than over 80% yield starting from formation of the substituted 3-iodochromones and tetrathiophentins by Stille cross-coupling reaction in the presence of palladium on charcoal-catalyzed ligand-free under mild conditions.
CuI/Cu(OSO2CF3)2 catalysed convenient approach to dichromenopyridines and triazole-thiazole appended chromone derivatives
Yerrabelly, Jayaprakash Rao,Porala, Subbanarasimhulu,Kasireddy, Venkateshwar Reddy,Ghojala, Venkat Reddy,Rebelli, Pradeep
, p. 3781 - 3790 (2021/11/01)
A variety of new pentacyclic dichromenopyridines have been synthesized from 2-amino chromone and O-propargyloxy salicilaldehydes through intramolecular Povarov reaction using CuI/Cu(OSO2CF3)2 as a Lewis acid catalyst. The
Synthesis of 2H-benzo[g]furo/thieno/pyrrolo[2,3-e]indazoles via Intramolecular Dehydrogenation Photocyclization
Liu, Zhicun,Wang, Ping,Wang, Rui,Wang, Tao,Zhang, Wei,Zhang, Xi,Zhang, Zunting
supporting information, p. 2213 - 2219 (2021/07/26)
A catalyst-, acid- and base-free, environmental-friendly method for synthesis of 2H-benzo[g]furo[2,3-e]indazoles, 2H-benzo[g]thieno[2,3-e]indazoles and 2H-benzo[g]pyrrolo[2,3-e]indazoles via UV light irradiation of 3-phenyl-4-(2-heteroaryl)pyrazoles (aryl
