Structure determinations of organometallic compounds of alkali metals often reveal new surprises: In the case of the sodium ketimide [( t Bu 2 CNNa) 4 (HNC t Bu 2 ) 2 ] 1 , nonmetalated ketimine units function surprisingly as monodentate ligands for two of the four Na + ions in the cubanelike (NNa) 4 framework. This contrasts significantly with the well‐known lithium ketimides such as ( t Bu 2 CNLi) 6 , which in general resist complexation. Applying the “ring‐stacking principle” from organolithium compounds, 1 can be interpreted as a twofold stack of (NNa) 2 rings.
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Clegg et al. (1992) studied this question.
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