经过长期的探索,人们也开发出一系列理化性质良好的Pd(II)催化剂前体,如Pd(OAc)2、PdCl2、PdCl2(MeCN)2、[PdCl(allyl)]2。还原剂则使用胺、有机膦、有机硼酸乃至有机金属试剂(如有机锌),反应体系相对复杂。 当然,如果一定要使用Pd(0)前体,Pd(PPh3)4、Pd2dba3也能满足大家的要求。尽管此时Pd的氧化态为0...
DFT 计算表明中间体 BI 更容易在 Pdn/NDG 催化剂上进一步氢化成 BA。而在Pd1/NDG催化剂上,BI更倾向于进行缩合反应并继续加氢得到DBA。在这些具有原子精度结构的催化剂上建立的选择性调节策略将为合理设计和构建具有充分金属利用效率的高选择性催化剂铺平道路。 图1 :的结构表征。a)低倍率下 Pd1/ND@G 的 HAADF...
A Pd complex resulting from oxidative addition of 4-bromobenzonitrile, (Xantphos)Pd(4-cyanophenyl)(Br) (II), was prepared in one step from Xantphos, Pd(2)(dba)(3), and the aryl bromide. Complex II proved to be an active catalyst for the coupling between 4-bromobenzonitrile and ...
本发明提供了一种制备Pd2(dba)3.CHCl3的方法,包括以下步骤:(a)使Pd(Ⅱ)络合物与碱金属卤化物在至少一种醇溶剂中反应;和(b)使步骤(a)的产物与包含二苄叉丙酮,氯仿和无机碱的混合物反应以形成Pd2(dba)3.CHCl3. The present invention provides a process for preparing Pd2 (dba) 3.CHCl3 method comprising ...
ChemInform Abstract: Pd2(dba)3×CHCl3/AsPh3 — A Powerful Catalyst System for Pd(0)-Mediated C—C-Bond Formation Pd2(dba)3 * CHCl3/AsPh3 - a powerful catalyst system for Pd(0)- mediated C C-bond formation. J Prakt Chem 1998; 340(1), 90-93... ...
DBA/2-pcy/pcy mice Dosage form Oral administration, 400 mg/kg daily for the first week and then every third day for 6 additional weeks Applications The body weight of the PD184352-treated pcy mice was slightly but significantly lower than that of the control pcy mice. The kidney weight, ...
The crystal structure of 2 shows it to be a regular triangulo -cluster with Pd-Pd bond distances 2.7225(9) Angstrom. Complex 1 reacted with dppm with displacement of dba to give [Pd-2(mu-SO2)(mu-dppm)(PBz(3))(2)] 3. The crystal structure of 3 shows it to have a much shorter...
Although the tris(dibenzylideneacetone)diplatinum complex (Pt(2)dba(3)) is an important source of Pt(0) used in catalysis and materials science, its structure has not yet been fully elucidated. A thorough study of the three-dimensional structure of Pt(2)dba(3) and its dynamic behavior in ...
, arylboronic acid (0.1 mmol, 2 equiv.), Pd2(dba)3 (0.0025 mmol, 5 mol%), L9 (0.006 mmol, 12 mol%), CsF (0.1 mmol, 2 equiv.) and THF/H2O (v/v, 9:1, 0.5 mL) under N2. The mixture was stirred at 30 oC, and the conversion was monitored by ...
Tuning of ligand sterics.aCrystal structure of {[(2-Me-Ph)3P]Pd(4-nBu-Ph)(Br)}2and concept of blocking of the axial sites on Pd.bModel coupling reaction for optimizing ligands (ortho-substituent optimization) Pd(PPh3)4was used due to insufficient yield with Pd2dba3/PPh3.cCrystal struct...