ORGANOMETALLIC COMPOUNDS OF THE LANTHANOIDS .73. SYNTHESIS AND STRUCTURE OF NEW MONOCYCLOOCTATETRAENYL COMPLEXES OF YTTRIUM, TERBIUM, AND LUTETIUM

[(C8H8)Ln(mu-Cl)(THF)]2 (Ln = Y, Lu) react with NaOR (R = Ph, C6H3Me2- 2,6) to give the dinuclear cyclooctatetraenyl rare earth alkoxides [(C 8H8)Ln(mu-OR)(THF)]2 [R = Ph, Ln = Y (1a), Lu (1 b); R = C6H3Me2-2,6, Ln = Y (2 a), Lu (2 b)]. The reactions of [(C8H8)Ln(mu-Cl)(THF)]2 with LiOC(tBu)3, NaOSiPh3, and NaC5H3tBu2 result in the formation of (C8H8 )LnOC(tBU)3(THF) [Ln = Y (3a), Lu (3b)], (C8H8)LnOSiPh3(THF) [Ln = Y ( 4a), Lu (4b)], and (C8H8)Tb(C5H3tBu2) (5), respectively. Treatment of (C8H8)Y(C5Me5) with acetylacetone yields (C5Me5)Y(acac)2 (6). The H-1- and C-13-NMR and mass spectra of the new compounds as well as the X-r ay crystal structures of 1 a and 5 are discussed.