51091-79-3Relevant academic research and scientific papers
Site-Selective C-H Functionalization-Sulfination Sequence to Access Aryl Sulfonamides
Alvarez, Eva Maria,Berger, Florian,Plutschack, Matthew B.,Ritter, Tobias
supporting information, (2020/04/21)
Aryl sulfinates are precursors to a diverse number of sulfonyl-derived arenes, which are common motifs in pharmaceuticals and agrochemicals. Here, we report a site-selective two-step C-H sulfination sequence via aryl sulfonium salts to access aryl sulfonamides. Combined with site-selective aromatic thianthrenation, an operationally simple one-pot palladium-catalyzed protocol introduces the sulfonyl group using sodium hydroxymethylsulfinate (Rongalite) as a source of SO22-. The hydroxymethyl sulfone intermediate generated from the catalytic process can be employed as a synthetic handle to deliver a variety of sulfonyl-containing compounds.
A New Hepta-Nuclear Ti-Oxo-Cluster-Substituted Tungstoantimonate and Its Catalytic Oxidation of Thioethers
Li, Hai-Lou,Lian, Chen,Yin, Da-Peng,Jia, Zhi-Yu,Yang, Guo-Yu
, p. 376 - 380 (2019/01/09)
A neoteric hepta-nuclear Ti-oxo-cluster-substituted tetrameric tungstoantimonate [H2N(CH3)2]22Na18{Ti7O6(SbW9O33)4}2·124H2O (1) has hydrothermally been synthesized and tested by single-crystal/powder X-ray diffraction, IR spectra, and thermal analysis. The glamorous feature of this tetrameric polyoxoanion is an uncommon hepta-nuclear Ti-oxo-cluster octahedron [Ti7O6]16+ enclosed in four [B-α-SbW9O33]9- building units. As a heterogeneous catalyst, the investigation on catalytic oxidation with H2O2 for multiple thioethers indicated that 1 possesses high conversion and remarkable selectivity. Additionally, 1 exhibits good stability and excellent recyclability.
Two Ce3+-Substituted Selenotungstates Regulated by N, N-Dimethylethanolamine and Dimethylamine Hydrochloride
Li, Hai-Lou,Lian, Chen,Chen, Li-Juan,Zhao, Jun-Wei,Yang, Guo-Yu
, p. 8442 - 8450 (2019/07/04)
Two multi-Ce3+-substituted selenotungstates (STs), [HDMEA][H2N(CH3)2]4H3Na4[Ce2(H2O)6(DMEA)W4O9(α-SeW9O33)3]·26H2O (1) and [H2N(CH3)2]10H4Na10[Ce2W4O9(H2O)7(α-SeW9O33)3]2·63H2O (2), were prepared by the one-pot approach of sodium tungstate, sodium selenite, and lanthanide nitrate in an acidic water solution in the presence of N,N-dimethylethanolamine (DMEA) or dimethylamine hydrochloride (DMAHC). 1 was obained in the presence of DMEA, whereas 2 was synthesized in the presence of DMAHC. The trimeric polyoxoanion of 1 contains an unusual V-shaped [Se3W29O103]20- group embracing a prominent heterometal oxide fragment, [Ce2(H2O)6(DMEA)W2O5]8+, and the hexameric polyoxoanion of 2 is constructed from two equivalent trimeric [Ce2W4O9(H2O)7(SeW9O33)3]2 24- subunits through two -O-W-O-Ce-O- linkages. The most worthy of attention is that the polyoxoanion of 1 can be approximatively viewed as a half of the polyoxoanion of 2 because of the coordination and blocking effect of DMEA. The stability of 1 and 2 in different water pH values was studied by electrospray ionization mass spectroscopy (ESI-MS), and the results manifest that 1 and 2 are stable in pH = 3.5-7.5 and 3.5-7.0, respectively. The oxidation reactions of aromatic sulfides catalyzed by H2O2 were studied when 1 or 2 worked as a catalyst, and experimental results reveal that 1 or 2 can serve as available catalysts for the oxidation of aromatic sulfides under mild conditions.
An efficient and convenient transformation of α-haloketones to α-hydroxyketones using cesium formate
Wong, Fung Fuh,Chang, Po-Wei,Lin, Hui-Chang,You, Bang-Jau,Huang, Jiann-Jyh,Lin, Shao-Kai
supporting information; experimental part, p. 3452 - 3455 (2010/01/11)
A new safe and convenient transformation has been developed. In the presence of cesium formate in dry MeOH solution, α-haloketones underwent direct conversion reaction to afford α-hydroxyketone in excellent yields. Furthermore, this methodology can be extended and applied in 2-chloro-N-(1,3-diphenyl-1H-pyrazol-5-yl)acetamide, 2-chloro-N-(2,6-dimethylphen-yl)acetamide, 1-(bromomethylsulfonyl)benzene, and N-(bromomethyl)phthalimide to give the corresponding products in moderate to excellent yields. Crown Copyright
