Generation and Reactivity of Neutral 1,3-Benzazaphosphole and Anionic 1,3-Benzazaphospholide Ytterbium(III) Complexes Huacheng Ying, Mingzhu Gong and Chengfu Pi Abstract Treatment of Cp3Yb with 5-R3-6-R1-2-R2-1H-1,3-benzazaphosphole(HBp) (HBp1(1a): R1 = H, R2 = 2,4,6-Me3C6H2, R3 = Me; HBp2(1b): R1 = Me, R2 = C6H5, R3 = H; HBp3(1c): R1 = R3 = H, R2 = C6H5) at room temperature gives the crystalline1:1 Lewis acid-base adducts [Cp3Yb(HBp)] (Bp = Bp1 (2a), Bp2 (2b), Bp3 (2c)) with Ln‒P donor bond...