10.1021/om030615f.s001
Ulrich Siemeling
Ulrich
Siemeling
Imke Scheppelmann
Imke
Scheppelmann
Beate Neumann
Beate
Neumann
Hans-Georg Stammler
Hans-Georg
Stammler
Wolfgang W. Schoeller
Wolfgang W.
Schoeller
Cyclopentadienone-like Behavior of Fluorenone and
4,5-Diazafluoren-9-one
American Chemical Society
2004
carbon monoxide
complex
compounds fluorenone
η 2
cobaltocenium species
Cp
structure type
acetyl chloride
2004-02-16 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Cyclopentadienone_like_Behavior_of_Fluorenone_and_4_5_Diazafluoren_9_one/3349933
The aromatic compounds fluorenone (<b>1</b>) and
4,5-diazafluoren-9-one (<b>2</b>) behave like cyclopentadienones in their reaction with [Cp*Co(C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>] (<b>3a</b>), affording the sandwich-type complexes [Cp*Co(η<sup>4</sup>-<b>1</b>)] (<b>4</b>)
and [Cp*Co(η<sup>4</sup>-<b>2</b>)] (<b>5</b>), respectively, whose structures have
been determined by X-ray diffraction. Both complexes
show double-bond fixation in their η<sup>2</sup>-coordinated six-membered rings and belong to a new structure type of
mononuclear organometallics. The cobalt-coordinated
ligands <b>1</b> and <b>2</b> present in <b>4</b> and <b>5</b>, respectively, may be
replaced by two molecules of carbon monoxide. In accord
with their cyclopentadienone-like nature, they are nucleophilic and undergo O-acylation with acetyl chloride,
affording cobaltocenium species.