Structural Influences in Lithium Pentadienylsilane
Complexes
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Abstract
Structurally characterized lithium
pentadienyls are very rare.
We report the molecular structures of two lithium pentadienyls, [(pmdeta)Li{1-(R<sub>3</sub>Si)C<sub>5</sub>H<sub>6</sub>}] (<b>3</b>) and [(pmdeta)Li{1,5-(R<sub>3</sub>Si)<sub>2</sub>C<sub>5</sub>H<sub>5</sub>}] (<b>4</b>) (R<sub>3</sub>Si = Me<sub>2</sub>(NMe<sub>2</sub>)Si, pmdeta = <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>″,<i>N</i>″-pentamethyldiethylenetriamine).
In <b>3</b>, the pentadienyl carbons adopt an η<sup>3</sup> coordination mode, whereas in <b>4</b> η<sup>1</sup> coordination is found. The origins of the different coordination
modes are discussed
