54845-69-1Relevant academic research and scientific papers
Palladium-catalyzed coupling reaction of perfluoroarenes with diarylzinc compounds
Ohashi, Masato,Doi, Ryohei,Ogoshi, Sensuke
, p. 2040 - 2048 (2014/03/21)
This report describes the first Pd0-catalyzed cross-coupling of hexafluorobenzene (C6F6) with diarylzinc compounds to give a variety of pentafluorophenyl arenes. This reaction could be applied to other perfluoroarenes, such as octafluorotoluene, pentafluoropyridine, and perfluoronaphthalene, to give the corresponding polyfluorinated coupling products. The optimal ligand in this catalytic reaction was PCy3, and lithium iodide was indispensable as an additive for the coupling reaction. One of the roles of lithium iodide in this catalytic reaction was to promote the oxidative addition of one Ci￡F bond of C6F 6 to palladium. Stoichiometric reactions revealed that an expected oxidative-addition product, trans-[Pd(C6F5)I(PCy 3)2], generated from the reaction of [Pd(PCy 3)2] with C6F6 in the presence of lithium iodide, was not involved in the catalytic cycle. Instead, a transient three-coordinate, monophosphine-ligated species, [Pd(C6F 5)I(PCy3)], emerged as a potential intermediate in the catalytic cycle. Therefore, we isolated a novel PdII complex, [Pd(C6F5)I(PCy3)(py)], in which pyridine (py) acted as a labile ligand to generate the transient species. In fact, in the presence of lithium iodide, this PdII complex was found to react smoothly with diphenylzinc to give the desired pentafluorophenyl benzene, whereas the same reaction conducted in the absence of lithium iodide resulted in a decreased yield of pentafluorophenyl benzene, which indicated that the other role of lithium iodide was to enhance the reactivity of the organozinc species during the transmetalation step.
Reactivity of Tetra-n-butylammonium Di-μ-chloro-bis. A General Method for the Synthesis of cis Isomers of Neutral and Anionic Palladium(II) Complexes
Uson, Rafael,Fornies, Juan,Espinet, Pablo,Martinez, Francisco,Tomas, Milagros
, p. 463 - 465 (2007/10/02)
The reaction of n4>2 with L (L = N, P, As, or Sb donor ligand) leads to the synthesis of novel anionic palladium complexes of the type n4>, which react with L to give the neutral complexes .Both families of compounds are the cis derivatives.Moreover, replacement of Cl by SCN or CN, and of L (SbPh3 or AsPh3) by PPh3, takes place without a change in configuration, giving again cis isomers.
