The reactivity of [Cp
2Ln(
![](/images/entities/mgr.gif)
-OH)(THF)]
2 (Ln = Y (
1), Er (
2), Yb (
3)) toward PhEtCCO, PhNCO, Cp
3Ln, [Cp
2Ln(
![](/images/entities/mgr.gif)
-CH
3)]
2, and the
LiCl adduct of Cp
2Ln
nBu(THF)
x was examined. In all cases, OH-centered reactivity is observed:complexes
1-
3 react with PhEtCCO to form the O-H addition products [Cp
2Ln(
![](/images/entities/mgr.gif)
-
1:
2-O
2CCHEtPh)]
2 (Ln = Yb(
5), Er (
6), Y (
7), respectively, for
1-
3), whereas treatment of
1 with PhNCO affords the addition/CpH-e
limination/rearrangement product [{Cp
2Y(THF)}
2(
![](/images/entities/mgr.gif)
-
2:
2-O
2CNPh)] (
8), which contains an unusual PhNCO
2 dianionic
ligand.Analogous compound [Cp
2Ln(THF)]
2(
![](/images/entities/mgr.gif)
-
2:
2-O
2CNPh) (Ln = Yb (
9), Er (
10)) and
8 can be obtained in a higheryield by treatment of [Cp
2Ln(
![](/images/entities/mgr.gif)
-OH)(THF)]
2 with PhNCO followed by reaction with the corresponding Cp
3Ln. However,attempts to prepare the corresponding heterobimetal
lic complex by reacting stoichiometric amounts of [Cp
2Y(
![](/images/entities/mgr.gif)
-OH)(THF)]
2 with PhNCO followed by treating it with Cp
3Yb are unsuccessful. Instead, only rearrangement products
8 and
9 are obtained. Furthermore, the reaction of
3 with [Cp
2Yb(
![](/images/entities/mgr.gif)
-CH
3)]
2 or Cp
3Yb forms oxo-bridged compound[Cp
2Yb(THF)]
2(
![](/images/entities/mgr.gif)
-O) (
11), whereas the reaction of [Cp
2ErCl]
2 with Li
nBu followed by treatment with
2 affords unexpected
![](/images/entities/mgr.gif)
-oxo lanthanocene cluster (Cp
2Er)
3(
![](/images/entities/mgr.gif)
-OH)(
3-O)(
![](/images/entities/mgr.gif)
-Cl)Li(THF)
4 (
12). In contrast to
1 and
2,
3 shows a strongtendency to undergo the intermolecular e
limination of CpH at room temperature, giving trinuclear species [Cp
2Yb(
![](/images/entities/mgr.gif)
-OH)]
2[CpYb(THF)](
3-O) (
4). The single-crystal X-ray diffraction structures of
1,
2, and
4-
12 are described.All the results offer an interesting contrast to transition- and main-metal hydroxide complexes.