In heterogeneous catalysis, the catalyst is in a different phase from the reactants. SDS of cas: 14871-92-2, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 14871-92-2, name is (2,2¡ä-Bipyridine)dichloropalladium(II). In an article£¬Which mentioned a new discovery about 14871-92-2
(2,4,6-tris(trifluoromethyl)phenyl)palladium(II) complexes
Complexes containing one or two Fmes ligands (Fmes = 2,4,6-tris(trifluoromethyl)phenyl = nonafluoromesityl) either trans or cis are obtained by treating palladium(II) chloro complexes with Li(Fmes): trans-[PdCl2L2] (L = tetrahydrothiophene (tht), PPh3) lead to trans[Pd(Fmes)ClL2] (L = tht, PPh3) or trans-[Pd(Fmes)2L2] (L = tht); [PdCl2(L-L)] (L-L = 1,5-cyclooctadiene, 2,2?-bipyridine) give [Pd(Fmes)Cl(L-L)} (L-L = COD, bipy) or [Pd(Fmes)2-(bipy)]. The structures of two complexes containing two Fmes ligands in trans and cis arrangement, trans-[Pd(Fmes)2(tht)2] (2) and [Pd(Fmes)2(bipy)] (6), respectively, have been determined by X-ray diffraction. In spite of the severe steric congestion the complexes are four coordinated. Distortions due to the bulkiness of the ortho substituents and short Pd…F3C-ortho distances are observed. The high degree of steric crowding is also responsible for slow rotation around the Pd-P bonds in the complex trans-[Pd(Fmes)Cl(PPh3)2]. DeltaG? associated with this motion is 12.8 kcal mol-1, one of the highest values reported so far for rotation around M-PPh3 bonds. Complexes 2 and 6 are redox inactive by cyclic voltammetry in the range -1.8 to +1.8 V.
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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method