13602-11-4Relevant articles and documents
A two-in-one pincer ligand and its diiron(II) complex showing spin state switching in solution through reversible ligand exchange
Samanta, Subhas,Demesko, Serhiy,Dechert, Sebastian,Meyer, Franc
, p. 583 - 587 (2015)
A novel pyrazolate-bridged ligand providing two {PNN} pincer-type compartments has been synthesized. Its diiron(II) complex LFe2(OTf)3(CH3CN) (1; Tf=triflate) features, in solid state, two bridging triflate ligands, with a terminal triflate and a MeCN ligand completing the octahedral coordination spheres of the two high-spin metalions. In MeCN solution, 1 is shown to undergo a sequential, reversible, and complete spin transition to the low-spin state upon cooling. Detailed UV/Vis and 19F NMR spectroscopic studies as well as magnetic measurements have unraveled that spin state switching correlates with a rapid multistep triflate/MeCN ligand exchange equilibrium. The spin transition temperature can be continuously tuned by varying the triflate concentration in solution.
Nickel-catalyzed carboxylation of aryl and heteroaryl fluorosulfates using carbon dioxide
Ma, Cong,Zhao, Chuan-Qi,Xu, Xue-Tao,Li, Zhao-Ming,Wang, Xiang-Yang,Zhang, Kun,Mei, Tian-Sheng
, p. 2464 - 2467 (2019/04/10)
The development of efficient and practical methods to construct carboxylic acids using CO2 as a C1 synthon is of great importance. Nickel-catalyzed carboxylation of aryl fluorosulfates and heteroaryl fluorosulfates with CO2 is described, affording arene carboxylic acids with good to excellent yields under mild conditions. In addition, a one-pot phenol fluorosulfation/carboxylation is developed.
Polysubstituted pyridine medical intermediate and synthetic method thereof
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, (2016/10/08)
The invention belongs to the field of medicine intermediate technology, and specifically relates to a polysubstituted pyridine medical intermediate and a synthetic method thereof. The polysubstituted pyridine medical intermediate is a key intermediate in pharmaceutical synthesis, and has a huge market potential. The synthetic method has simple synthetic route, simple and easily available staring material, and has great meaning in synthesis of pyridine intermediate, development of pyridine medicament and research and development of novel medicament, and the product is cheap.
CO2 Conversion into Esters by Fluoride-Mediated Carboxylation of Organosilanes and Halide Derivatives
Frogneux, Xavier,Von Wolff, Niklas,Thuéry, Pierre,Lefèvre, Guillaume,Cantat, Thibault
, p. 2930 - 2934 (2016/03/25)
A one-step conversion of CO2 into heteroaromatic esters is presented under metal-free conditions. Using fluoride anions as promoters for the C-Si bond activation, pyridyl, furanyl, and thienyl organosilanes are successfully carboxylated with CO2 in the presence of an electrophile. The mechanism of this unprecedented reaction has been elucidated based on experimental and computational results, which show a unique catalytic influence of CO2 in the C-Si bond activation of pyridylsilanes. The methodology is applied to 18 different esters, and it has enabled the incorporation of CO2 into a polyester material for the first time. Metal free! A novel methodology is described to convert CO2 into heteroaromatic esters in the presence of organosilanes and organic halides using fluoride anions as promoters for the C-Si bond activation (see scheme). CO2 exhibits a unique catalytic influence in the C-Si bond cleavage of pyridylsilanes, serving as a traceless activator.
