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Departmental Seminar

Dr. Glen Briand
Chemistry Department, Mount Allison University, Science Atlantic Tour Speaker

Thu, April 30, 2015, 1:00 pm
Room C3033

‘Exploring the Use of Indium(III) Dithiolates as Green Lewis Acid Catalysts’

Abstract:
There has been increasing interest in main group metals as alternatives to expensive and toxic transition and rare earth metals as catalysts for chemical transformations.1 Notably, indium reagents are well-established Lewis acid catalysts in organic syntheses, though the majority of compounds that have been studied include simple trivalent salts such as triflates, chlorides and oxides.2 More recently, organometallic indium alkoxide and amide compounds have been shown to be useful for the ring opening polymerization (ROP) of cyclic esters to yield biodegradable polymers.3 An objective of our research program is to develop the potentially rich and “tunable” reaction chemistry of Lewis acidic main group organometallic complexes. Indium thiolates are attractive candidates for such studies due to the favorability of the In-S bond, which allows for the facile synthesis and hydrolytic stability of target compounds. This lecture will focus on our recent studies into the synthesis and structural characterization of: 1) methyl indium dithiolates and their use as Lewis acid cataylsts for the ring opening polymerization (ROP) of cyclic esters; and, 2) cationic indium dithiolate complexes and their suitability as water tolerant Lewis acid catalysts for organic reactions in aqueous media.

1) a) Kobayashi, S.; Ueno,M.; Kitanosono, T. Top. Curr. Chem. 2012, 311, 1; b) Chivers, T.; Konu, J. Comm. Inorg. Chem. 2009, 30, 131.
2) Schneider, U.; Kobayashi, S. Acc. Chem. Res. 2012, 45, 1331.
3) Dagorne, S.; Normand, M; Kirillov, E.; Carpentier, J.F. Coord. Chem. Rev. 2013, 257, 1869.

Please note that Dr. Briand is the Science Atlantic Tour Speaker