| RESEARCH |
Chemistry professor John A. Gladysz at the University of Erlangen-Nuremberg, in Germany, has been carrying out fluorous catalysis in the absence of fluorous solvents. "We have found that many fluorous compounds exhibit highly temperature-dependent solubilities in organic solvents," he said. "Such 'thermomorphic' behavior allows fluorous catalysts to be used under one-phase conditions at elevated temperatures in ordinary organic solvents and recovered by a simple liquid-solid phase separation at low temperature." Recently, Gladysz and coworker Long V. Dinh reported a "catalyst-on-a-tape" method that employs a tape made of DuPont's Teflon to deliver and recover homogeneous fluorous catalysts from a reaction mixture (Angew. Chem. Int. Ed. 2005, 44, 4059; C&EN, June 27, page 38). They showed that the technique can be applied to hydrosilylation and olefin metathesis reactions. |
|
Want more information ? Interested in the hidden information ? Click here and do your request. |