Reactions of gallium hydrides with 1,4-di-t-butyl-1,4-diazabutadiene; subvalent and hydrometallation products

Abstract

Reaction of LiGaH₄ and gallium metal with 1,4-di-t-butyl-1,4-diazabutadiene (dbdab) in diethyl ether at room temperature yields the monomeric, formally gallium(II) species [Ga(dbdab)₂], (1), previously prepared using metal vapours, and GaH₃·NMe₃ with dbdab in hexane at –80 °C yields the novel hydrogallation product [{H₂Ga}₂{µ-N(Bu_t)CH₂}₂], (2) which has magnetically distinct geminal hydrides (²J_HH 44 Hz) in agreement with the crystal structure (<Ga–N>2.01₃Å, <Ga–H> 1.5₆Å) and IR data (νGa–H 1920, 1870 cm^–1).