COA of Formula: C26H24P2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Understanding the acrylates formation from CO2 and ethylene over Ni- and Pd-based catalysts: A DFT study on the effects of solvents, methyl halides, and ligands. Author is Zhu, Youcai; Guo, Xing; Ding, Xinxin; Sun, Li; Zhang, Mingguo; Liu, Zhen.
In this work, two methylation reaction pathways were investigated to explore the role of solvent and I- on the formation of Me acrylate from coupling of CO2 and ethylene catalyzed by nickel and palladium catalysts in the presence of MeI. The stabilization of non-productive intermediates is inhibited in the gas phase as well as in low-polar solvents, which explains the requirement of high excess of MeI to obtain high yields of Me acrylate. The energy barrier for M-O bond cleavage as well as the stability of the overall reaction intermediates is consistent with the corresponding halogen electron-donating ability. The different catalytic behaviors of various bidentate ligands on Ni- and Pd-based catalysts were systematically investigated, mainly including dmpe(1,2-bis(dimethylphosphino)ethane), tmeda(tetramethylethylenediamine), dppe(1,2-bis(diphenylphosphino)ethane), dcpe(1,2-bis(dicyclohexylphosphino)ethane) and dtbpe(1,2-bis(di-tert-butylphosphino)ethane). The energy barrier of M-O bond cleavage increases with the enhancement of ligand steric hindrance in the O1 (ester sp3 O atom) attack mechanism, while the corresponding O2 (carboxylic sp2 O atom) attack mechanism shows an opposite trend. The energy barrier of β-H elimination in both catalytic systems is strongly related to the electron-donating ability of the diphosphine ligand substituents. The dcpp(1,3-bis(dicyclohexylphosphino)propane) ligand shows relatively good performance for β-H elimination among all the investigated ligands in Pd-mediated system. In general, diphosphine ligands are superior to diamine ligands in Pd-mediated system in terms of efficiency.
Different reactions of this compound(1,2-Bis(diphenylphosphino)ethane)COA of Formula: C26H24P2 require different conditions, so the reaction conditions are very important.
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Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis