Metalation of 2‐Quinolyl‐Linked (Boranophosphinoyl)methane −Alkali Metal, Alkaline Earth Metal, and Ytterbium(II) Complexes of Monoanionic [CH(iPr2P−BH3)(C9H6N‐2)]− Ligand

Abstract

AbstractA series of alkali and alkaline earth metal complexes, and an ytterbium(II) complex of monoanionic [CH(iPr2P−BH3)(C9H6N‐2)]− ligand (abbreviated as LQPB−) were synthesized. Lithium complexes [Li(LQPB)(TMEDA)] (2, TMEDA=Me2NCH2CH2NMe2) and [Li(LQPB)(12‐crown‐4)] (3) were prepared by lithiation of 1 with LinBu in the presence of TMEDA and 12‐crown‐4 ether, respectively. Treatment of 2 with NaOtBu and KOtBu, respectively, followed by addition of 18‐crown‐6 ether yielded monomeric sodium complex [Na(LQPB)(18‐crown‐6)] (4) and polymeric potassium derivative [K(LQPB)(18‐crown‐6)]n (5). Metalation of 1 with MgnBu2/TMEDA afforded [Mg(LQPB)2(TMEDA)] (6). Heavier group 2 complexes [Ca(LQPB)2(DME)2] (7), [Sr(LQPB)2]2 (8) and [Ba(LQPB)2(DME)] (9) were synthesized by metalation of 1 with the corresponding alkaline earth metal amide M[N(SiMe3)2]2(DME)n (M=Ca or Ba, n=2; M=Sr, n=0) in toluene under reflux conditions. Treatment of YbI2(THF)2 with potassium complex 5 led to isolation of mononuclear Yb(II) complex [Yb(LQPB)2(18‐crown‐6)] (10).