Well‐Defined, Molecular Bismuth Compounds: Catalysts in Photochemically Induced Radical Dehydrocoupling Reactions
Jacqueline Ramler, Ivo Krummenacher, Crispin Lichtenberg
Abstract
A series of diorgano(bismuth)chalcogenides, [Bi(di-aryl)EPh], has been synthesised and fully characterised (E=S, Se, Te). These molecular bismuth complexes have been exploited in homogeneous photochemically-induced radical catalysis, using the coupling of silanes with TEMPO as a model reaction (TEMPO=(tetramethyl-piperidin-1-yl)-oxyl). Their catalytic properties are complementary or superior to those of known catalysts for these coupling reactions. Catalytically competent intermediates of the reaction have been identified. Applied analytical techniques include NMR, UV/Vis, and EPR spectroscopy, mass spectrometry, single-crystal X-ray diffraction analysis, and (TD)-DFT calculations.
Topics & Concepts
CatalysisBismuthElectron paramagnetic resonanceChemistryCoupling reactionPhotochemistryArylSilanesRadicalMass spectrometrySingle crystalHomogeneous catalysisCombinatorial chemistryOrganic chemistryCrystallographySilaneNuclear magnetic resonanceAlkylPhysicsChromatographyRadical Photochemical ReactionsSulfur-Based Synthesis TechniquesCatalytic C–H Functionalization Methods