1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 1038-95-5, Product Details of 1038-95-5
An extended series of phosphines (L), having widely different steric and electronic properties, was used to study the kinetics of chloride substitution on the cyclometallated complex [Pt(N-N-C)Cl] (N-N-CH = 6-(1-methylbenzyl)-2,2?-bipyridine). The final cationic products [Pt(N-N-C)(L)]+ were fully characterised by 1H and 31P{1H} NMR spectroscopy in CDCl3 solution. The values of the 1J(PtP) coupling constants for these complexes showed interesting dependencies upon the size and the sigma-donor ability of the ligands. The reaction, in dichloromethane as solvent at 298.2 K, takes place by way of a direct bimolecular attack of the ligand on the substrate, with no evidence of a significant solvent contribution. The order of reactivity is that expected on the basis of the nucleophilic reactivity constants (nPPt), derived from previous studies. The values of the second-order rate constants (k2, M-1 s-1) can be resolved quantitatively into steric, electronic and aryl contributions of the phosphine ligands, by use of a four-parameter equation k2 = alpha + beta(pKa?) + gamma(theta) + delta(Ear), where pKa? measures the sigmar-donor ability of the phosphines, theta (Tolman’s cone angle) is a measure of the size of the P-donor ligand, and Ear is related to the number of aryl groups attached to the ligand phosphorus atom. This is the first reported example of an aryl effect contributing to the nucleophilicity of phosphines as entering ligands on square-planar complexes. No steric threshold is observed. Steric and electronic profiles for the substitution process can be plotted showing the dependence of rates on the size and the sigma-donor ability of the phosphines. The sensitivity of the rates to pKa? is significant (beta = 0.20 ± 0.04) and this is related to the structural properties of the substrate.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Product Details of 1038-95-5. In my other articles, you can also check out more blogs about 1038-95-5
Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate