Author(s): 
Lutz Greb
Author(s): 
Pascual Ona-Burgos
Author(s): 
Birgitta Schirmer
Author(s): 
Stefan Grimme
Author(s): 
Douglas W. Stephan
Subject: 
Catalytic reactions of lignin derivatives
Date: 
Fri, 08/31/2012

Weak nucleophiles for strong activation: The reversible activation of dihydrogen by an electron-deficient phosphine, (C6F5)PPh2, in combination with the Lewis acid B(C6F5)3 at -80°C was accomplished. The catalytic hydrogenation of olefins proceeds through protonation and subsequent hydride attack. Electron-deficient phosphines and diarlyamines were demonstrated to be viable Lewis bases for the reaction, thus allowing catalyst loadings of 10 to 5 mol %.