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, Recommanded Product: 1038-95-5
The kinetics of reactions of the high-nuclearity carbonyl cluster (HNCC), Ru5C(CO)15, with 21 P-donor nucleophiles, L, to form Ru5C(CO)14 L have been studied. The nucleophiles were chosen such that their electronic (pKa? = -2.79 to 12.20) and steric (Tolman cone angles, theta= 101-182) properties are systematically varied. With 10 smaller nucleophiles (theta ? 133) the reactions occur via two well-separated steps: adduct formation and CO-dissociation from the adducts to form the monosubstituted products. The structures of the adducts formed are shown spectroscopically to be closely related to others reported and structurally characterized elsewhere. The rate equations for the two steps are effectively kobs = k+L[L] and kobs = k-cO, respectively. With 11 larger nucleophiles (theta ? 136) the reaction is a quite different, second-order one-step, process with no spectral evidence for adduct formation being observed. Quantitative analysis of the dependence of the various rate constants on the electronic and steric properties of the nucleophiles or ligands involved shows that adduct formation of this HNCC with the group of smaller nucleophiles is much more facile than any comparable nucleophile-dependent reactions of other metal carbonyls. The rates of loss of CO from the adducts are decreased both by increasing net electron donicity of the ligands involved and by increasing the size of those ligands. The rate constants for the single-step reactions with the group of larger P-donors depend on the latters’ electronic and steric properties in a way showing that major expansion of the cluster is required to form the transition states and this is only possible by virtue of an exceptionally high degree of Ru-nucleophile bond-making. The flexibility of the transition state, once formed, is exceptionally low.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Recommanded Product: 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