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- Title
Sterically Bulky NHC Adducts of GaMe<sub>3</sub> and InMe<sub>3</sub> for H<sub>2</sub> Activation and Lactide Polymerization.
- Authors
Bolley, Anaëlle; Schnee, Gilles; Thévenin, Lucas; Jacques, Béatrice; Dagorne, Samuel
- Abstract
The sterically bulky Ga(III) and In(III) (IPr*)MMe3 adducts (1 and 2) and (SItBu)MMe3 adducts (3 and 4) (M = Ga, In; IPr* = 1,3-bis{2,6-bis(diphenylmethyl)-4-methylphenyl}-1,3-dihydroimidazol-2-ylidene; SItBu = 1,3-bis(1,1-dimethylethyl)-imidazolidin-2-ylidene) were prepared and structurally characterized, allowing an estimation of the steric hindrance of such Lewis pairs (yields in 1-4: 92%, 90%, 73%, and 42%, respectively). While the IPr* adducts 1 and 2 are robust species, the more severely congested SItBu adducts 3 and 4 are more reactive and exhibit a limited stability in solution. Adduct (SItBu)GaMe3 (3) reacts quickly with H2 at room temperature to afford the corresponding aminal product, 1,3-di-tert-butylimidazolidine (5), along with free GaMe3. Such Frustrated Lewis Pair (FLP) reactivity constitutes the first instance of a H2 activation involving a simple trialkyl GaR3 species. Adduct 3 also mediates the ring-opening polymerization (ROP) of rac-lactide at room temperature to afford cyclic polylactide (PLA).
- Subjects
HETEROCYCLIC compounds; ACTIVATION (Chemistry); POLYMERIZATION; LACTIDES; IMIDAZOLIDINES; CHEMICAL yield
- Publication
Inorganics, 2018, Vol 6, Issue 1, p23
- ISSN
2304-6740
- Publication type
Article
- DOI
10.3390/inorganics6010023