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Structural Characterization and Dynamic Solution Behavior of the Disodio and Lithio−Sodio Geminal Organodimetallics [{{Ph<sub>2</sub>P(Me<sub>3</sub>Si)N}<sub>2</sub>CNa<sub>2</sub>}<sub>2</sub>] and [{{Ph<sub>2</sub>P(Me<sub>3</sub>Si)N}<sub>2</sub>CLiNa}<sub>2</sub>]

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References

2006

Year

Abstract

The title disodio complex may be prepared by the double deprotonation of a neutral bis(phosphinimine) ligand using 2 equiv of the strong base n-BuNa, whereas the mixed Li/Na derivative can be prepared by controlled sequential deprotonation, by transmetalation, or by mixing the homometallic analogues. The compounds form dimers with the ligands capping an Na4 square or a Li2Na2 rhomboid, and these are the first examples of R2C2- dianions containing a heavy alkali metal to be structurally characterized.

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