A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article，once mentioned of 1038-95-5, Computed Properties of C21H21P
Tetrahedral Mo2Ir2(mu3-CO)(mu-CO)5(CO)4(eta5-C5H5)2 (1) reacted with P(C6H4Me-4)3, P(C6H2Me2-3,5-OMe-4)3, and AsPh3 to afford the substitution products Mo2Ir2(mu-CO)3(CO)6(L)(eta5-C5H5)2 [L = P(C6H4Me-4)3 (3), P(C6H2Me2-3,5-OMe-4)3 (4), AsPh3 (5)] in fair to good yields, while reaction of 1 with HC?CSiPri3 proceeded by insertion into the Mo-Mo bond to give the pseudo-octahedral Mo2Ir2(mu4-eta2-HC2SiPri3)(mu-CO)4(CO)4(eta5-C5H5)2 (6) in fair yield. While MoIr3(mu-CO)3(CO)7(eta5-C5H5) reacted with HC?CSiMe3 to give a complex mixture of thus-far-uncharacterized products, its phosphine substitution product MoIr3(mu-CO)3(CO)5(PPh3)2(eta5-C5H5) reacted with the same alkyne via insertion into a Mo-Ir bond to afford the pseudo-octahedral MoIr3(mu4-eta2-HC2SiMe3)(mu-CO)3(CO)4(PPh3)2(eta5-C5H5) (8) in good yield. Clusters 4, 5 (two isomers), 6 and 8 have been characterized by single-crystal X-ray diffraction studies. Cyclic voltammetric studies of Mo2Ir2(mu-CO)3(CO)6(PPh3)(eta5-C5H5)2 (2), 3-6 and 8 confirmed the tuning of redox potentials upon phosphines/arsine introduction and alkyne modification. IR spectroelectrochemical studies of 2, 6, and 8 suggest decreasing proclivity for bridging carbonyl ligands following oxidation. Variable temperature 31P NMR studies of 3 and 4 revealed interconverting isomers in solution, the structures of which are assigned as analogues of the X-ray diffraction-confirmed isomers of 5. Studies of 2-5 using ns pulses and the open-aperture Z-scan technique revealed that all are optical limiters at wavelengths in the visible region.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Computed Properties of C21H21P. 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