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The synthesis of bis(1-tert-butyl-2 -methyl-η 5  - 1 ,2 -azaborolinyl)ruthenium (1) and bis(2-methyll- trimethylsilyl-η 5  - 1 ,2 -azaborolinyl)ruthenium (2) succeeds when RuCL is reacted with the corresponding 1,2-azaborolinyl lithium compounds in THF at -70 °C. Each of the sandwich complex forms two isomers with a clockwise and an anti-clockwise conformation of the azaborolinyl rings. The anti-clockwise isomer of 1 (1a ) gives colourless crystals which were investigated by singlecrystal X-ray diffraction methods. The molecular structure shows the rings in an eclipsed orientation forming an interplanar angle of 8.6 °. The isomers of 1 as well as of 2 give different  1 H and  11 B NMR signals.

zeitschrift für naturforschung b

Azaborolinyl-Komplexe, XV. Bis(η 5 -1,2-azaborolinyI)ruthenium-Sandwichkomplexe – Darstellung und Strukturuntersuchung/ Azaborolinyl Complexes, XV. Bis(η 5 -1,2-azaborolinyl)ruthenium Sandwich Complexes – Synthesis and Structure Investigation