| Abstract
| - The new tantalum dialkoxide complexes Cp*TaCl2(OCH2)2py (1), trans-Cp*TaMe2(OCH2)2py (2), and cis-Cp*TaMe2(OCH2)2py (3) (Cp* = η5-C5Me5; (OCH2)2py = 2,6-pyridinedimethoxide) have been synthesized. The molecular structures of complexes 1 and 2 have been studiedby X-ray diffraction methods. The reaction of complex 3 with carbon monoxide renders Cp*Ta(η2-Me2CO)(OCH2)2py (4), while with isocyanides yields the respective azatantalacyclopropanes Cp*Ta(η2-Me2CNxylyl)(OCH2)2py (6) (xylyl = 2,6-dimethylphenyl) and Cp*Ta(η2-Me2CNtBu)(OCH2)2py (7). The molecular structure of complex 4 has been established byX-ray diffraction. The coordinated ketone in 4 can be reduced to 2-propanol in the presenceof water. On the other hand, compound 3 reacts with triflic acid (HOTf) to render thecorresponding cationic derivative [Cp*TaMe(OCH2)2py]OTf (8).
- New monocyclopentadienyl complexes of tantalum(V) bearing pincer dialkoxide ligands are described along with their reactivity.
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