Monday, July 18, 2005, 11:00 am — Hamilton Seminar Room, Bldg. 555
Polyols of the general composition HOCH2(CHOH)nCH2OH (n = 1-4) are among the most abundant biomolecules on the planet and in principle constitute a renewable resource of C3 to C6 polymer building blocks, if new pathways and catalysts for their selective deoxygenation to the corresponding diols HOCH2(CH2)nCH2OH can be developed. The deoxygenations can be achieved through an iterative cascade of acid-catalyzed dehydration and metal catalyzed hydrogenation and hydrogenolysis reactions in the same reactor vessel. Some principle pathways of these reactions and specific guidelines for the design of catalysts capable of operating under the required acidic aqueous conditions will be discussed. A series of new metal-ligand bifunctional homogeneous catalysts meeting these guidelines are ruthenium complexes that incorporate chelating 2,2’-bipyridine and 1,10-phenanthroline ligands, ortho-functionalized with amino groups acting as internal proton acceptors/donors. The complexes are postulated to activate hydrogen gas in a heterolytic fashion and thus effect the hydrogenation and/or hydrogenolysis through a proton/hydride transfer, an ionic mechanism that should enable both a ionic hydrogenation of C=O and C=C double bonds and a ionic hydrogenolysis of aliphatic C-O ether bonds by the same catalyst system.
Hosted by: R. Morris Bullock
2338 | INT/EXT | Events Calendar
Not all computers/devices will add this event to your calendar automatically.
A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.
Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.