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In an article, published in an article, once mentioned the application of 1038-95-5, Name is Tri-p-tolylphosphine,molecular formula is C21H21P, is a conventional compound. this article was the specific content is as follows.HPLC of Formula: C21H21P
Kinetic data are reported for the addition of a range of tertiary phosphines and phosphites to the dienyl cation (I) (eq. 1.).The rate law depends on the nature of the nucleophile.For example, the reactions with PBun3 and P(OBun)3 obey the expression kobs = k1, while the two-term equation kobs = k1+k-1 is followed for reversible addition of PPh3.The low enthalpies of activation (DeltaH+1 15-36 kJ mol-1) are consistent with biomolecular addition of PR3 to the C8H11 ligand, as are the large negative entropies of activation (DeltaS+1 -91 to 124 J K-1 mol-1).The basicity of the phosphorous nucleophiles is shown to be important (Bronsted slope, alpha, ca. 0.5) in determining the nucleophilicity towards cation I.An excellent linear free energy relationship is found between reactions 1 and the related additions of phosphines and phosphites to the cation +, suggesting similar transition states for each process. I + PR3 <-->+ (1) The analogous additions of PBun3 to the cations + (IIIa) and + (IIIb) are very much slower.The relative electrophilicities of the cations I >> IIIa >> IIIb (rel. rates 4E4 / 2.5E2 / 1) are found to be enthalpy controlled (DeltaH+1 15, 31 and 38 kJ mol-1 respectively).
Do you like my blog? If you like, you can also browse other articles about this kind. HPLC of Formula: C21H21P. Thanks for taking the time to read the blog 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