Homogeneous Catalysis of O-Silylation Reactions Using Octacarbonyldicobalt(O)

Hikmat S. Hilal's picture
Journal Title, Volume, Page: 
Microchemical Journal Volume 33, Issue 3, June 1986, Pages 392-398
Year of Publication: 
Hikmat S. Hilal
Chemistry Department, An-Najah National University, Nablus, West Bank, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Preferred Abstract (Original): 

Octacarbonyldicobalt(O) has been used to catalyze the reaction of R3SiH (R = Et and EtO) with R′OH (R′ = Me, Et, n-Pr, i-Pr, and t-Bu). The reaction of MeOH with (EtO)3SiH, in toluene at 27 °C, was first-order with respect to the catalyst, to the silane, and to the alcohol. The order of reactivity of the alcohols was MeOH > EtOH > n-PrOH > i-PrOH > t-BuOH, reflecting the steric effect associated with the size of the organic group. Addition of triphenyl phosphine (Ph3P) to the reaction mixture slowed down the reaction. The reaction proceeds faster if nonpolar solvents are used, and the rate of the reaction is very sensitive to temperature.