The new homoleptic rare earth compound [Y(C(SiHMe(2))(3))(3)] () is prepared in 82% yield by salt metathesis of YCl(3) and 3 equivalents of [KC(SiHMe(2))(3)] (); two beta-agostic Y(H-Si) interactions are observed for each C(SiHMe(2))(3) ligand in , giving six agostic interactions per yttrium(iii) center.