Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. COA of Formula: C34H28O2Pd. Introducing a new discovery about 32005-36-0, Name is Bis(dibenzylideneacetone)palladium
The synthesis of, and characterization of the dynamic processes occurring in Pd(ii) chelate complexes of 2-pyridyldiphenylphosphine
Pd(ii) complexes in which 2-pyridyldiphenylphosphine (Ph2Ppy) chelates the Pd(ii) centre have been prepared and characterized by multinuclear NMR spectroscopy and by X-ray crystallographic analysis. trans- [Pd(kappa1-Ph2Ppy)2Cl2] is transformed into [Pd(kappa2-Ph2Ppy)(kappa1- Ph2Ppy)Cl]Cl by the addition of a few drops of methanol to dichloromethane solutions, and into [Pd(kappa2-Ph 2Ppy)(kappa1-Ph2Ppy)Cl]X by addition of AgX or TlX, (X = BF4-, CF3SO3 – or MeSO3-). [Pd(kappa1-Ph 2Ppy)2(p-benzoquinone)] can be transformed into [Pd(kappa2-Ph2Ppy)(kappa1-Ph 2Ppy)(MeSO3)][MeSO3] by the addition of two equivalents of MeSO3H. Addition of further MeSO3H affords [Pd(kappa2-Ph2Ppy)(kappa1-Ph 2PpyH)(MeSO3)][MeSO3]2. Addition of two equivalents of CF3SO3H, MeSO3H or CF 3CO2H and two equivalents of Ph2Ppy to [Pd(OAc)2] in CH2Cl2 or CH2Cl 2-MeOH affords [Pd(kappa2-Ph2Ppy) (kappa1-Ph2Ppy)X]X, (X = CF3SO 3-, MeSO3- or CF3CO 2-), however addition of two equivalents of HBF 4¡¤Et2O affords a different complex, tentatively formulated as [Pd(kappa2-Ph2Ppy)2]X 2. Addition of excess acid results in the clean formation of [Pd(kappa2-Ph2Ppy)(kappa1-Ph 2PpyH)(X)]X2. In methanol, addition of MeSO3H and three equivalents of Ph2Ppy to [Pd(OAc)2] affords [Pd(kappa2-Ph2Ppy)(kappa1-Ph 2Ppy)2][MeSO3]2 as the principal Pd-phosphine complex. The fluxional processes occuring in these complexes and in [Pd (kappa1-Ph2Ppy)3Cl]X, (X = Cl, OTf) and the potential for hemilability of the Ph2Ppy ligand has been investigated by variable-temperature NMR. The activation entropy and enthalpy for the regiospecific fluxional processes occuring in [Pd(kappa2- Ph2Ppy)(kappa1-Ph2Ppy)2][MeSO 3]2 have been determined and are in the range -10 to -30 J mol-1 K-1 and ca. 30 kJ mol-1 respectively, consistent with associative pathways being followed. The observed regioselectivities of the exchanges are attributed to the constraints imposed by microscopic reversibility and the small bite angle of the Ph2Ppy ligand. X-Ray crystal structure determinations of trans-[Pd(kappa1- Ph2Ppy)2Cl2], [Pd(kappa2-Ph 2Ppy)(kappa1-Ph2Ppy)Cl][BF4], [Pd(kappa1-Ph2Ppy)2(p-benzoquinone)], trans-[Pd(kappa1-Ph2PpyH)2Cl 2][MeSO3]2, and [Pd(kappa1-Ph 2Ppy)3Cl](Cl) are reported. In [Pd(kappa2- Ph2Ppy)(kappa1-Ph2Ppy)Cl][BF4] a donor-acceptor interaction is seen between the pyridyl-N of the monodentate Ph2Ppy ligand and the phosphorus of the chelating Ph2Ppy resulting in a trigonal bipyramidal geometry at this phosphorus.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.COA of Formula: C34H28O2Pd, you can also check out more blogs about32005-36-0
Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method