Heteroleptic Copper-Based Complexes for Energy-Transfer Processes: <i>E</i> → <i>Z</i> Isomerization and Tandem Photocatalytic Sequences
Corentin Cruché, William Neiderer, Shawn K. Collins
Abstract
Energy-transfer processes involving copper complexes are rare. Using an optimized heteroleptic copper complex, Cu(bphen)(XantPhos)BF4, photosensitized E → Z isomerization of olefins is demonstrated. The XantPhos ligand afforded sensitizers with improved catalyst stability, while the bphen ligand lengthened the excited-state lifetime. A series of 25 di- and trisubstituted alkenes underwent photoisomerization, including macrocycles and 1,3-enynes. Cu(bphen)(XantPhos)BF4 could also be employed in a tandem ATRA/photoisomerization process employing arylsulfonyl chlorides, an example of photoisomerization with halide-substituted olefins.
Topics & Concepts
XantphosPhotoisomerizationIsomerizationChemistryTandemPhotochemistryCopperCatalysisLigand (biochemistry)Organic chemistryMaterials sciencePalladiumComposite materialReceptorBiochemistryRadical Photochemical ReactionsCatalytic C–H Functionalization MethodsSulfur-Based Synthesis Techniques