Synthesis, structures and reactions of ytterbium(II) alkyls

Abstract

Treatment of Ybl₂ with 2 NaCHR₂ gave [Yb(CHR₂)₂(OEt₂)₂]1 in Et₂O, but Yb(CHR₂)₃Na in n-C₆H₁₄{1 was also obtained from 2 KCHR₂ and [Yb(OAr)₂(OEt₂)₂]}, while Ybl₂ and 2 KCR₃ in Et₂O gave [{Yb(CR₃)(µ-OEt)(OEt₂)}₂]7; [Yb(CHR₂)(OAr)(thf)₃] was prepared from [Yb(OAr)₂(thf)₃] and KCHR₂, and [[graphic omitted]R}₂] or [[graphic omitted]HR₂]6 form 1+ 4 PhCN or 1+ 2 Bu^tCN in Et₂O, respectively; ¹⁷¹Yb NMR spectral data confirmed the identity of each of the ytterbium(II) compounds, and single crystal X-ray results are presented for 6 and 7(R = SiMe₃, Ar = 2,6-Bu^t₂-4-Me-C₆H₂).