将新聚合物聚(2,5-亚噻吩硒化物)(PTSe)和聚(2,5-亚噻吩硫醚)(PTS)的高度纯化的样品暴露于五氟化砷,得到了PTSe的导电配合物(0.12 S / cm),但仅与PTS形成中等传导性的络合物(约10 – 5 S / cm),这一结果与聚(对苯亚硒酸酯)和聚对苯硫醚在相似处理下的行为形成直接对比。
The novel title tetraselenacalix[4]arene, C16H8S4Se4 or [(C4H2S)Se](4), has a centrosymmetric cyclic molecular structure with approximate C-2h molecular symmetry. The four thienyl rings are joined together by Se bridges and exhibit a syn-syn-anti-anti arrangement around the molecule. The lattice consists of skewed stacks of molecules, with chalcogen- chalcogen close contacts binding the stacks together, forming a two-dimensional network of molecules.
A three-component reaction of olefin, diselenide and water, alcohols, phenol, carboxylic acid, or amine by a commercially available hypervalent iodine(III) reagent, PhIO, was developed. This method provides access to a wide range of vicinally functionalized selenoderivatives under ambient conditions with mostly excellent yields and high diastereoselectivity. The developed reaction displays high levels
A visible-light-induced oxidativecoupling of diselenides with readily available vinylarenes is demonstrated. This benign protocol allows one to access a wide range of α-aryl and α-alkyl selenomethyl ketones in good yields with excellent functional group compatibility. The distinct advantages of this protocol over all previous methods include the use of a green solvent and air as an oxidant and the
A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethersfrom (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salts
Regioselective, Solvent- and Metal-Free Chalcogenation of Imidazo[1,2-<i>a</i>
]pyridines by Employing I<sub>2</sub>
/DMSO as the Catalytic Oxidation System
作者:Jamal Rafique、Sumbal Saba、Alisson R. Rosário、Antonio L. Braga
DOI:10.1002/chem.201600800
日期:2016.8.8
molecular‐iodine‐catalyzed chalcogenations (S and Se) of imidazo[1,2‐a]pyridines were achieved by using diorganoyl dichalcogenides undersolvent‐freeconditions. This approach afforded the desired products that had been chalcogenated regioselectively at the C3 position in up to 96 % yield by using DMSO as an oxidant, in the absence of a metal catalyst, and under an inert atmosphere. This mild, green approach allowed
通过在无溶剂条件下使用二有机基二卤化氢实现咪唑并[1,2- a ]吡啶的高效分子碘催化硫属元素化(S和Se)。通过使用DMSO作为氧化剂,在没有金属催化剂的情况下,并且在惰性气氛下,该方法提供了所需的产物,该产物已经在C3位置进行了区域硫磺化,产率高达96%。这种温和的绿色方法可以制备具有结构多样性的不同类型的硫族化咪唑并[1,2- a ]吡啶。此外,当前协议还扩展到其他N杂环核。
Copper-Catalyzed 8-Aminoquinoline-Directed Selenylation of Arene and Heteroarene C–H Bonds
作者:Anup Mandal、Harekrishna Sahoo、Mahiuddin Baidya
DOI:10.1021/acs.orglett.6b01420
日期:2016.7.1
An efficient copper-catalyzed/-mediated and 8-aminoquinoline-assisted arylselenylation of inert C–H bonds of (hetero)arenes with readily available diselenides has been reported. The reaction is scalable and tolerates a wide spectrum of functional groups to deliver diarylselenides in very high yields (up to 98%). Application of this methodology to the facile synthesis of thiophene-fused selenochromone