Chemistry is traditionally divided into organic and inorganic chemistry. name: Tris(dibenzylideneacetone)dipalladium-chloroform, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 52522-40-4
Reactions of Pd(PPh3)4 with P(=E)(N iPr2)(naph) (6, E = S; 7, E = O) (naph = 1,8-naphthylene) having a strained four-membered P(V)-phosphacycle gave dimeric complexes [Pd{kappa2P,C-mu2-PEP(=E)(NiPr 2)(naph)}(PPh3)]2 (9, E = S; 10, E = O), in which a Pd metal has been inserted into a P-C bond of the phosphacycle to form a phosphapalladacycle having a P(V) donor, and the two phosphapalladacycle units have been mutually bridged with E=P groups, as confirmed by X-ray structure analysis for thermodynamically more stable racemic isomers 9a and 10a. The meso-to-racemic isomerization observed for the simultaneously formed meso isomer 9b, and probably also for the corresponding meso isomer 10b, indicated partial dissociation of 9 and 10 taking place to their monomer units in solution, which were actually trapped as [Pd{kappa2P,C-P(=E)(NiPr 2)(naph)}(dppe)] by treatment with bidentate dppe (dppe = 1,2-bis(diphenylphosphino)ethane). On the other hand, a similar treatment of 9a with monodentate PMe3 and PEt2Ph resulted in a trivial substitution of both PPh3 ligands to give dimeric PMe3 and PEt2Ph analogues of 9a, respectively. 10a was found to react with O2 to form an unprecedented oxidation product, [Pd{kappa 2P,O-mu2-PO-PO(=O)(NiPr2)(naph)}(PPh 3)]2, 17, in which an oxygen atom has been inserted into each P(V)-Pd bond. 9a and 10a exhibited moderate catalytic activities for a Heck reaction between PhI and styrene. The mercury test indicated that metallic Pd nanoparticles released from 9a and 10a would be practical catalysts.
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Reference：
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method