In Situ Phosphine Oxide Reduction: A Catalytic Appel Reaction
作者:Henri A. van Kalkeren、Stefan H. A. M. Leenders、C. Rianne A. Hommersom、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1002/chem.201101563
日期:2011.9.26
reactions in organic chemistry thrive on stoichiometric formation of phosphineoxides from phosphines. To avoid the resulting burden of waste and purification, cyclic phosphineoxides were evaluated for new catalytic reactions based on in situ regeneration. First, the ease of silane‐mediated reduction of a range of cyclic phosphineoxides was explored. In addition, the compatibility of silanes with electrophilic
Visible Light-Driven, Gold(I)-Catalyzed Preparation of Symmetrical (Hetero)biaryls by Homocoupling of Arylazo Sulfones
作者:Lorenzo Di Terlizzi、Simone Scaringi、Carlotta Raviola、Riccardo Pedrazzani、Marco Bandini、Maurizio Fagnoni、Stefano Protti
DOI:10.1021/acs.joc.2c00225
日期:2022.4.1
The preparation of symmetrical (hetero)biaryls via arylazo sulfones has been successfully carried out upon visiblelight irradiation in the presence of PPh3AuCl as the catalyst. The present protocol led to the efficient synthesis of a wide range of target compounds in an organic-aqueous solvent under photocatalyst-free conditions.
作者:Lakshmi Nilakantan、David R. McMillin、Paul R. Sharp
DOI:10.1021/acs.organomet.6b00275
日期:2016.7.25
We report here a series of emissive biphenyl cyclometalated gold(III) diethyl dithiocarbamate complexes having H, CF3, OMe, and Bu-t substitutions on the biphenyl moiety. Synthesis of these complexes was accomplished by a single-step reaction of the appropriate dilithio-biphenyl reagent with Au(dtc)Cl-2 (dtc = diethyl dithiocarbamate). All four complexes exhibit weak room-temperature phosphorescence in solution and much more intense phosphorescence in the solid state and in low temperature glasses with lifetimes in the microseconds. From experimental data and computational modeling, the emission originates mainly from a metal-perturbed (3)(pi-pi*) state of the biphenyl moiety with a minor contribution from ligand-to-ligand charge transfer. Weak solution emission is attributed to deactivation via a distorted charge-transfer state that is less accessible in the solid state or in a low-temperature glass.
BRUNE, HANS-ALBERT;HOHENADEL, ROBERT;SCHMIDTBERG, GUNTHER;ZIEGLER, ULRICH, J. ORGANOMET. CHEM., 402,(1991) N, C. 171-178