Dicationic Heteroacenes Containing Thio- or Selenopyrylium Moieties
摘要:
Dicationic heteroacenes that bear thio- or selenopyrylium moieties were synthesized by addition reactions of the corresponding diones with a Grignard reagent, followed by a dehydration reaction of the resulting diols with Bronsted acid. Alternatively, these dicationic heteroacenes were obtained from two-electron oxidations of the corresponding sulfur- or selenium-containing quinoids. The electronic structures of these dicationic heteroacenes were examined by NMR and UV-vis-NIR spectroscopy in conjunction with density functional theory calculations. The results of this combined experimental and theoretical approach strongly imply effective conjugation of 22 pi-electrons in a system that is distributed over the entire pentacene framework.
complexes have been developed. The visible-light induced reactions can be applied for the synthesis of a series of unsymmetrical diaryl selenides employing aryl bromides, aryl iodides as well as aryl chlorides under mild reaction conditions. The scale-up was readily achieved. UV-Vis spectroscopy measurements provide insight into the reaction mechanism.
Iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation of indols with benzeneselenols
作者:Senling Guan、Yue Chen、Hongjie Wu、Runsheng Xu
DOI:10.1039/d0ra05922f
日期:——
An iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation was developed. Starting from sample indols and benzeneselenols versatile biologically active 2-benzeneselenonyl-1H-indoles derivatives were efficiently synthesized. The reaction mechanism was studied by the deuterium isotope study and in situ ESI-MS experiments. This protocol features mild reaction conditions, wider substrate
Homoleptic ruthenium(iii) chalcogenolates: a single precursor to metal chalcogenide nanoparticles catalyst
作者:Sharon Lai-Fung Chan、Kam-Hung Low、Gary Kwok-Ming So、Stephen Sin-Yin Chui、Chi-Ming Che
DOI:10.1039/c1cc12422f
日期:——
Eight homoleptic metal(III) arylchalcogenolate polymers [M(EPh-p-X)3]n (M = Ru, Cr, and Mo) were characterized by PXRD. Structural solution of [Ru(SPh-p-tBu)3]n1 was achieved by Rietveld refinement of the PXRD data. Pyrolysis of [Ru(SePh)3]n4 produced nanostructured RuSe2, which selectively catalyzed the reduction of nitro compounds in the presence of other functionalities.