Effect of pressure on sterically congested cyanoalkylation reactions of alcohols
作者:G. Jenner
DOI:10.1016/s0040-4020(02)00347-2
日期:2002.5
The pressure effect on the phosphine-catalyzed nucleophilic addition of alcohols to unsaturated nitriles is examined. As a general result, pressure promotes these reactions. Their sensitivity to pressure increases with increasing steric congestion of either the alcohol or the nitrile. Activation volumes are found to be very negative pointing not only to a late transition state, but essentially to a
Template catalysis by manganese pincer complexes: oxa- and aza-Michael additions to unsaturated nitriles
作者:Shan Tang、David Milstein
DOI:10.1039/c9sc03269j
日期:——
alcohols and amines. Mechanistically, the catalysis is mostly ligand based. Reaction of the dearomatized PNN–Mn complex with 2-pentenenitrile or 3-pentenenitrile furnished an enamido–Mn complex. The equilibrium between an enamido complex and a ketimido complex, and reversible C–C bond formation with the ligand are proposed to play central roles in the catalysis.