Reaction of a germylene, stannylene, or plumbylene with trimethylaluminum and trimethylgallium: insertion into Al-C or ga-C bonds, a reversible metal-carbon insertion equilibrium, and a new route to diplumbenes

Jeremy D Erickson; James C Fettinger; Philip P Power

doi:10.1021/ic502824w

Reaction of a germylene, stannylene, or plumbylene with trimethylaluminum and trimethylgallium: insertion into Al-C or ga-C bonds, a reversible metal-carbon insertion equilibrium, and a new route to diplumbenes

Inorg Chem. 2015 Feb 16;54(4):1940-8. doi: 10.1021/ic502824w. Epub 2015 Jan 28.

Authors

Jeremy D Erickson¹, James C Fettinger, Philip P Power

Affiliation

¹ Department of Chemistry, University of California , One Shields Avenue, Davis, California 95616, United States.

PMID: 25629212
DOI: 10.1021/ic502824w

Abstract

The reaction of the tetrylenes Ge(Ar((Me)6))2, Sn(Ar((Me)6))2, and Pb(Ar((Me)6))2 [Ar((Me)6) = C6H3-2,6-(C6H2-2,4,6-(CH3)3)2] with the group 13 metal alkyls trimethylaluminum and trimethylgallium afforded (Ar((Me)6))2Ge(Me)AlMe2 (1), (Ar((Me)6))2Ge(Me)GaMe2 (2), and (Ar(Me6))2Sn(Me)GaMe2 (3) in good yields via insertion reaction routes. In contrast, the reaction of AlMe3 with Sn(Ar((Me)6))2 afforded the [1.1.1]propellane analogue Sn2{Sn(Me)Ar((Me)6)}3 (5) in low yield, and the reaction of AlMe3 or GaMe3 with Pb(Ar((Me)6))2 resulted in the formation of the diplumbene {Pb(Me)Ar((Me)6)}2 (6) and AlAr((Me)6)Me2 (7) or GaAr((Me)6)Me2 (8) via metathesis. The reaction of Sn(Ar((Me)6))2 with gallium trialkyls was found to be reversible under ambient conditions and analyzed through the reaction of Sn(Ar((Me)6))2 with GaEt3 to form (Ar((Me)6))2Sn(Et)GaEt2 (4), which displayed a dissociation constant Kdiss and ΔGdiss of 8.09(6) × 10(-3) and 11.8(9) kJ mol(-1) at 296 °C. The new compounds were characterized by X-ray crystallography, NMR ((1)H, (13)C, (119)Sn, and (207)Pb), IR, and UV-vis spectroscopies.