Chemistry, like all the natural sciences, begins with the direct observation of nature¡ª in this case, of matter.72-19-5, Name is H-Thr-OH, SMILES is N[C@@H]([C@H](O)C)C(O)=O, belongs to catalyst-ligand compound. In a document, author is Belli, Roman G., introduce the new discover, Quality Control of H-Thr-OH.
Reversible Silylium Transfer between P-H and Si-H Donors
The Mo=PR2 pi* orbital in a Mo phosphenium complex acts as acceptor in a new P-III-based Lewis superacid. This Lewis acid (LA) participates in electrophilic Si-H abstraction from E3SiH to give a Mo-bound secondary phosphine ligand, Mo-PR2H. The resulting Et3Si+ ion remains associated with the Mo complex, stabilized by eta(1)-P-H donation, yet undergoes rapid exchange with an eta(1)-Si-H adduct of free silane in solution. The equilibrium between these two adducts presents an opportunity to assess the role of this new LA in catalytic reactions of silanes: is the LA acting as a catalyst or as an initiator? Preliminary results suggest that a cycle including the Mo-bound phosphine-silylium adduct dominates in the catalytic hydrosilylation of acetophenone, relative to a putative cycle involving the silane-silylium adduct or free silylium.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 72-19-5 is helpful to your research. Quality Control of H-Thr-OH.
Reference:
Metal catalyst and ligand design,
,Ligand Template Strategies for Catalyst Encapsulation – NCBI