Two-Step Synthesis of Unsymmetrical Diaryl Sulfides by Electrophilic Thiolation of Non-functionalized (Hetero)arenes
作者:Marvin J. Böhm、Christopher Golz、Isabelle Rüter、Manuel Alcarazo
DOI:10.1002/chem.201802806
日期:2018.10.9
article reports the efficient preparation of a series of unsymmetrically substituted thioethers through a two‐step procedure consisting of an initial metal‐free C−H sulfenylation of electron‐rich (hetero)arenes with newly prepared succinylthioimidazolium salts. Subsequent reaction of the arylthioimidazolium intermediates with Grignard reagents afford the desired thioethers. The synthetic protocol described
Orientational Effect of Aryl Groups in Aryl Selenides: How Can <sup>1</sup>H and <sup>13</sup>C NMR Chemical Shifts Clarify the Effect?
作者:Satoko Hayashi、Kentaro Yamane、Waro Nakanishi
DOI:10.1021/jo070988g
日期:2007.9.1
(B: pd) and (A: pl) are predominant for Y = NMe2 and NO2, respectively, the equilibrium constants change from Y to Y in the solutions. The results are supported by the quantum chemical calculations, containing the solvent effect of chloroform. These results demonstrate that δ(H, C: 1) and δ(H, C: 2), as well as δ(Se), serve as the practical standards for pl and pd, respectively, to analyze the structures
DMSO/iodine-catalyzed oxidative C–Se/C–S bond formation: a regioselective synthesis of unsymmetrical chalcogenides with nitrogen- or oxygen-containing arenes
作者:Sumbal Saba、Jamal Rafique、Antonio L. Braga
DOI:10.1039/c5cy01503k
日期:——
greener protocol to access different types of unsymmetrical chalcogenides with nitrogen- or oxygen-containing arenes through oxidative C–Se/C–S formation via direct C(sp2)–H bond activation was developed. The products were obtained in good to excellent yields using [O or N]-containing arenes, half equiv. of various odorless diorganyl dichalcogenides (S/Se), iodine (20 mol%) as the catalyst and 3 equiv