Oxidative addition of cyclic alkyl(amino)carbenecoordinated phosphinidenes (Me cAAC)PX to LGa affords gallium-coordinated phosphinidenes LGa(X)-P(Me cAAC) (L = HC[C(Me)N(2,6-i-Pr 2 C 6 H 3)] 2 ;X = Cl 1,B r2), which react with NaBAr F 4 and LiAl(OR F) 4 to [LGaP(Me cAAC)][An] (An = B(C 6 H 3 (CF 3) 2) 4 3,B (C 6 F 5) 4 4,A l(OC(CF 3) 3) 4 5). The cations in 3-5 show substantial Ga À Pd ouble bond character and represent heteronuclear analogues of allyl cations according to quantum chemical calculations.The reaction of 4 with 4dimethylaminopyridine (dmap) to adduct 6 confirms the strong electrophilic nature of the gallium center,w hereas 5 reacts with ethyl isocyanate with C À Cbond formation to the g-Ca tom of the b-diketiminate ligand and formation of compound 7. Scheme 1. Structurallyc haracterized cations A-F (E:R= I, H, Me, Et); F:R= Si(i-Pr)[CH(SiMe 3) 2 ] 2); A, D:E= Si, Ge) and resonance structures of allyl and heavier homologues.