The use of the Fischer method of synthesis to prepare chelated mononuclear biscarbene complexes is limited. As such, only three examples of symmetric complounds are known. To prepare chelated mononuclear biscarbene complexes on a desired substrate, lithium-halogen exchange, active site blocking and a combination of both, are employed. The reactivity and structural characteristics of these complexes, with two different carbene ligands have proven to differ dramatically from known carbene complexes. The asymmetric carbene complexes show regioselectivity towards aminolysis, oxidation and insertion reactions. Structural studies demonstrate the planarity of the metallocycle. The first lithium-aggregates containing a carbene moiety were isolated and stabilised by a unique grid-like packing. The isolation and characterisation require stringent manipulation conditions. The synthetic strategy will open avenues for further exploration and expansion of the chelate carbene complexes.
 

Time: 10:00 – 11:00

Date: Wednesday 5 February 2014

Venue: Auditorium, level 3, Merensky Library

Enquiries: Prof S. Lotz, 012 420 2800