By courtesy of:
Yingxin Liu, Philip G. Jessop,* Michael Cunningham, Charles A. Eckert, Charles L. Liotta
Science 2006, 313, 958
New development:
Carbon Dioxide Induced Phase Switching for Homogeneous-Catalyst Recycling
Simon. L. Desset and David J. Cole-Hamilton*
Angew. Chem. Int. Ed. 2009, 48, 1472–1474