Chemistry is traditionally divided into organic and inorganic chemistry. category: catalyst-palladium, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 14871-92-2
The compounds [PdCl2(5HtpO)2], [Pd 2(5tpO)4]·4H2O and [Pd 2(a-a)2 (5tpO)2]·nH2O with 5HtpO = 4,5-dihydro-1,2,4-triazolo[1,5-a]pyrimidine-5-one and a-a = bipyridine (bpy), phenanthroline (phen) or trans-diaminocyclohexane (t-dach) have been synthesized. The relative disposition of the ligands is, according to single crystal X-ray analysis, head-tail-head-tail for [Pd2(5tpO) 4]·4H2O and head-tail for the compounds with a-a = phen or t-dach. On the contrary, the NMR data for the compound with a-a = bpy indicates a head-head disposition in solution. This article describes the synthesis, spectroscopic characterization and single crystal X-ray structure of several Pd(II) dinuclear complexes with the ligand 4,5-dihydro-1,2,4-triazolo[1, 5-a]pyrimidine-5-one (5HtpO) in its anionic form (5tpO-). The synthesis and characterization of the related mononuclear compound [PdCl 2(5HtpO)2] is also included. This compound is transformed into the dinuclear [Pd2(5tpO)4]·4H2O by raising the pH, the structure of which indicates a head-tail-head-tail disposition of the heterocycles (D2d symmetry) as a difference with the analogous Cu(II) and Pt(II) clusters. Using the auxiliary ligands bipyridine (bpy), phenanthroline (phen) and trans-1,2-diaminocyclohexane (t-dach, racemic mixture), dinuclear compounds with the general formula [Pd2(5tpO) 2(a-a)2](NO3)2·nH 2O are obtained. The crystal structure of those with a-a = phen and a-a = t-dach have been solved showing a head-tail disposition of the organic ligands, in contrast with the NMR data for a-a = bpy, which point to a head-head disposition.
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Reference：
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method