酢酸パラジウム(II)

説明酢酸パラジウム(II)は三量体構造を有し、その対称性は約D3hである。各パラジウム原子は、ジアセテート架橋を介して他の2つのパラジウム原子と結合している[1]。主に反応触媒として、酸化、カップリング、アミナーゼ、置換などの反応系に用いられる。OLED材料や医薬品の活性分子の合成に適している。

用途反応制御系触媒

使用Palladium (II) Acetate Trimer is used in Suzuki-Miyaura cross-coupling reactions and a catalyst for intramolecular coupling. It also serves to catalyze the chemoselective reduction of nitroarenes.

一般的な説明Palladium(II) acetate is a homogenous oxidation catalyst. It participates in the activation of alkenic and aromatic compounds towards oxidative inter- and intramolecular nucleophilic reactions. Crystals of palladium(II) acetate have a trimeric structure, having symmetry D3h. Each of the palladium atoms in the crystals are joined to the other two by double acetate bridges. Microencapsulation of palladium(II) acetate in polyurea affords polyurea-encapsulated palladium(II) acetate. It is a versatile heterogeneous catalyst for various phosphine-free cross-coupling reactions. It participates as catalyst in the Heck coupling reaction of pthalides with different alkenes.

製造方法The synthesis of palladium acetate was first reported by Wilkinson et al.,where glacial acetic acid containing palladium powder is heated at reflux with a minimal amount of nitric acid until the generation of brown NOx fumes ceases. Although this is a relatively old method, it is still the most commercially employed route for the synthesis of palladium acetate, considering the process economics. Palladium (II) Acetate can be synthesized in two steps from palladium sponge via the intermediate dinitrate by first combining it with hot glacial acetic acid and nitric acid:Pd + 2 HNO3 → Pd(NO3)2 + H2Pd(NO3)2 + 2 CH3COOH → Pd(O2CCH3)2 + 2 HNO3

合成方法N,N-ジメチルベンジルアミンとアリールパラジウム錯体が生成される

純化方法It recrystallises from CHCl3 as purple crystals. It can be washed with AcOH and H2O and dried in air. Large crystals are obtained by dissolving it in *C6H6, adding half its volume of AcOH and allowing it to evaporate slowly at room temperature. It forms green adducts with nitrogen donors, it dissolves in KI solution to form solid PdI2 and a red solution of PdI42-, but is insoluble in aqueous saturated NaCl, and NaOAc. It dissolves in HCl to form PdCl42-. It is soluble in CHCl3, CH2Cl2, Me2CO, MeCN, Et2O, but it is insoluble in H2O, and decomposes when warmed in alcohols in which it is also insoluble. [Morehouse et al. Chem Ind (London) 544 1964, Stephenson et al. J Chem Soc 3632 1965, Skapski & Smart J Chem Soc (D) 658 1970, Heck Acc Chem Res 12 146 1979.]