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Reactions of Pentafulvene Complexes of Titanium with Carbonyl Compounds − Diastereoselective Synthesis of σ,π-Chelate Complexes with Cp~O Ligands

✍ Scribed by Jörg Stroot; Rüdiger Beckhaus; Wolfgang Saak; Detlev Haase; Arne Lützen

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
287 KB
Volume
2002
Category
Article
ISSN
1434-1948

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✦ Synopsis

The compound Cp*Ti[η 6 -C 5 H 4 C(H)(tBu)]Cl (1) reacts with ketones, aldehydes, and esters to give σ,π-chelate complexes with Cp~O ligands through insertion of the carbonyl group into the Ti-C(H)(tBu) bond. Starting from diastereomerically pure 1, the reaction with symmetric ketones R 2 CO led to the formation of two diastereomeric products. The diastereomeric ratio could be controlled by steric and electronic properties of the substituent R. Thus, this procedure provides an

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G (CH=NR)} 2 TiCl 2 ] (2), were unsuccessful. All complexes were characterised by 1 H and 13 C NMR spectroscopy, and the molecular structures of 3 a, 4 ac, 5 a, and 5 c were determined by Xray crystallography.