Investigating the effects of steric hindrance on the coordination of 2-aminothiazoyl based ligands
摘要:
The ligands 2-(diphenylphosphino)aminothiazole (dppat) 2-(diphenylphosphino)amino-4-methylthiazole (Medppat) and 2-(diphenylphosphino)amino-4-tert-butylthiazole (Budppat) have been prepared. Reaction of these ligand with MCl2 (COD) gives [MCl(dppat-P,N)(dppat-P)][Cl], [MCl(Medppat-P,N)(Medppat-P)][Cl], and [PtCl2 ('Bu-dppat-P-2], respectively. The increased bulk at the 4-position limits the formation of a P, N system in Budppat. The X-ray structure of [PtCl(Medppat-P,N)(Medppat-P)][Cl] reveals that the monodentate ligand has undergone a tautomerism upon coordination. (c) 2004 Elsevier B.V. All rights reserved.
Palladium(II) complexes of aminothiazole‐based phosphines: Synthesis, structural characterization, density functional theory calculations and catalytic application in heck reaction
作者:Khodayar Gholivand、Mohammad Kahnouji、S. Mark Roe、Akram Gholami、Farzaneh T. Fadaei
DOI:10.1002/aoc.3793
日期:2017.11
promote catalytic activity of the complexes in comparison with our previous work in which chelated ligands with two phosphorus atoms, P^P, were used. The influence of non‐covalent intermolecular interactions on the assembly of the solid‐state structures is also discussed in terms of geometrical analysis. The prepared complexes turn out to be useful pre‐catalysts in Heck cross‐coupling reactions owing
Unexpected synthesis of an Au<sub>2</sub>In<sub>2</sub> tetrametallatricyclic complex from α-aminophosphines and formation of Au–In–P and Ag–In–P nanomaterials
作者:Hsiao Wei Chen、T. S. Andy Hor、Roberto Pattacini、Pierre Braunstein
DOI:10.1039/c5dt02457a
日期:——
Four Au–(μ-phosphinite)–In units form an unprecedented Au2In2 12-membered metallacycle which intersects at the In centres an 8-membered ring containing two In–μ-phosphinate linkages, resulting in a tricyclic structure.
or exo-cyclic nitrogenatom. The two tautomers show different reactivities toward alcoholysis; the imino form degrades more rapidly. Their bischelated platinum complexes were studied in the solidstate by single crystal X-ray diffraction. Thus, the unique stereoelectronic features of the [Pt(PN(th))] (PN(th)=diphenylposphino-aminothiazoline) moiety were revealed. The complex cis-[Pt(PN(th))(2)] reacts
the additive HBF4 is beneficial for the formation of rutheniumhydrogen active species. The formation and stabilization of the critical Ru-complex intermediates were verified by the DFT calculations. The hydroformylation proceeds with high chemical selectivity especially for the linear, internal and cyclic olefins (conversion up to 99 %, selectivity of aldehysdes up to 92 %).
Combination of transition metal Rh-catalysis and tautomeric catalysis through a bi-functional ligand for one-pot tandem methoxycarbonylation-aminolysis of olefins towards primary amides
作者:Peng Wang、Lei Liu、Zhoujie Luo、Qing Zhou、Yong Lu、Fei Xia、Ye Liu
DOI:10.1016/j.jcat.2018.03.003
日期:2018.5
catalysis has been emerged as a powerful strategy to promote organic transformations that cannot be achieved by each individual independently. Herein, a new protocol for the synthesis of primary amides from olefins, CO and NH3 through one-pot tandem methoxycarbonylation-aminolys was presented over a bi-functional ligand (L1) based rhodium catalyst with functions of co-catalysis. L1 is composed of the phosphino-fragment