Activation of a Si
Si Bond by η1-Coordination to a Transition Metal
Abstract

Reaction of the disilenide 1 with Cp2ZrCl2 yields 2, the first transition metal complex with an η1-σ-bonded disilene moiety. The compound 2 exhibits a strongly red-shifted UV−vis absorption, resulting in an intensely green color. The Si
Si bond in 2 is considerably activated as shown by the rearrangement to a silyl-substituted zirconocene 3. X-ray diffraction studies on 2 reveal that the Si
Si bond is significantly longer than that in the precursor 1. Conversely, the Zr−Si distance is considerably smaller than the corresponding distance in 3, suggesting a certain degree of electron donation toward the 16e- zirconium center.
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