Wilkinson's catalyst Part-2 - mechanism - catalytic cycle - CSIR NET GATE SET IIT JAM скачать в хорошем качестве

Wilkinson's catalyst Part-2 - mechanism - catalytic cycle - CSIR NET GATE SET IIT JAM

#Wilkinsons_catalyst #wilkinsons_catalyst_catalytic_cycle #adichemistry_free_online_coaching ‪@AdiChemAdi‬ Mechanism & catalytic cycle for Wilkinson's catalyst is explained by Aditya vardhan V, https://www.adichemistry.com/. https://www.adichemistry.com/inorgani... It involves oxidative addition, migratory insertion of H2, &reductive elimination. Indeed, Wilkinson's catalyst is a pre-catalyst that is converted to an active form by losing one triphenylphosphine ligand before entering the catalytic cycle. Usually, the solvent molecule fills the vacant site. Initially, the catalyst activates the molecular dihydrogen by oxidative addition mechanism to give an 18 valence electron dihydrido complex. The oxidation state of Rh is increased to +3. Thus formed dihydrido complex binds to the olefin in the next step with the concomitant loss of solvent or PPh3 ligand. Since the activation of dihydrogen occurs before addition of olefin, this path is referred to as dihydride path . Now one of the hydrogens undergoes migratory insertion at the double bond. This is a slow step i.e., Rate Determining Step (RDS). Immediately and finally, the alkane is released rapidly by an irreversible reductive elimination step that completes the catalytic cycle. The oxidation state of Rh is decreased to +1 and the catalyst is regenerated.