om960375m_si_001.cif (32.26 kB)
Pentabenzylcyclopentadienides of Lithium
dataset
posted on 1996-10-29, 00:00 authored by Carsten Dohmeier, Elke Baum, Achim Ecker, Ralf Köppe, Hansgeorg Schnöckel(Pentabenzylcyclopentadienyl)lithium
(Li(η5-C5Bz5)) has been
prepared by lithiation of
pentabenzylcyclopentadiene with tert-butyllithium in toluene
or benzene. This compound,
which is the nonisolated starting material for most of the known
pentabenzylcyclopentadienides, has been characterized by NMR and mass spectroscopy. The
molecular structure of
the benzene adduct of dimeric
Li(η5-C5Bz5) has been
determined by X-ray diffraction studies.
A triple-decker-like structure,
(η5-C5Bz5)Li(η5-C5Bz5)Li(η2-C6H6),
results. The reaction of
Li(η5-C5Bz5) with
Al(η5-C5Me5) leads to
Al(η5-C5Bz5) and
Li(η5-C5Me5), with
[Li(η5-C5Bz5)2][Al(η5-C5Me5)2] as a side product.
The molecular structure of the last-named compound
consists
of the separated sandwich ions
[Li(η5-C5Bz5)2]-
and
[Al(η5-C5Me5)2]+.
