Synthesis and characterization of cyclohexadienyl-based constrained geometry complexes

Citation
Sg. Feng et al., Synthesis and characterization of cyclohexadienyl-based constrained geometry complexes, ORGANOMETAL, 18(7), 1999, pp. 1159-1167
Citations number
75
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
18
Issue
7
Year of publication
1999
Pages
1159 - 1167
Database
ISI
SICI code
0276-7333(19990329)18:7<1159:SACOCC>2.0.ZU;2-9
Abstract
The novel constrained geometry complexes [eta(5):eta(1)-C5H4EMe2-SiMe2-N(t- Bu)]TiX2, 5a (E = C, X = Cl), 5b (E = C, X = Me), 6a (E = Si, X = Cl), and 6b (E = Si, X = Me), based on dimethylcyclohexadienyl and dimethylsilacyclo hexadienyl ligands have been prepared and characterized by H-1 and C-13{H-1 } NMR spectroscopy and single-crystal X-ray structure analysis (5a and 6a). These complexes are the first examples of compounds containing eta(5) "ope n" dienyl ligands (pentadienyl or cyclohexadienyl) for titanium in its high est (4+) oxidation state. The crystallographic and electrochemical analysis of these complexes demonstrate that "open" dienyl ligands can be used as a viable replacement for the cyclopentadienyl ring in complexes containing a pendant amido group.