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...
The ligand dba plays a crucial role both on the structure and on the reactivity of palladium(0) complexes generated in situ in mixtures of Pd(dba)2 and phosphine ligands. Whatever the ligand, the major complex is always Pd(dba)L2 where L is a monodentate phosphine ligand or Pd(dba)(L...
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... ...
The catalytic performance results show that the transfer hydrogenation of BN is drastically different over the atomically dispersed Pd1/ND@G and Pdn/ND@G catalysts. BN shows high selectivity to secondary amines DBA over the single Pd atoms, while the fully exposed Pd clusters can selectively conver...
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 ...
The crystal structure of 2 shows it to be a regular triangulo-cluster with Pd–Pd bond distances 2.7225(9) . Complex 1 reacted with dppm with displacement of dba to give [Pd2(-SO2)(-dppm)(PBz3)2] 3. The crystal structure of 3 shows it to have a much shorter Pd–Pd bond length...
Iron in the basal ganglia in Parkinson's disease. An in vitro study using extended X-ray absorption fine structure and cryo-electron microscopy.Brain. 铁和阿尔茨海默病 铁可能是AD和APOE4病理关联之间的一个中介; Alzheimer disease: Iron--the missing link betw...
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...
X-ray crystallography on as-grown platelets gives a crystal structure consistent with Pd2(dba)3, but reveals a composition of ≈Pd1.07(dba)3, indicating one Pd atom in Pd2(dba)3 is lost from the structure. Both electron beam and thermally induced decomposition of as-grown Pd2(dba)3 ...
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。