Abstract
The reactions of R 2P–P(SiMe 3) 2 (R = Ph, i Pr and i Pr 2N) with BuLi in THF or DME solution lead to ion-contacted lithium derivatives R 2P–P(SiMe 3)Li · 3THF (R = i Pr, i Pr 2N) with tetrahedrally surrounded Li atoms and to the solvent-separated ionic [Li · 3DME] +[Ph 2P–PSiMe 3] − with an octahedrally surrounded Li atom as confirmed by X-ray crystal structure analysis. The reaction of BuLi with Ph 2P–P(SiMe 3) 2 is accompanied with a significant side-reaction leading to Ph 2P–PPh 2 and to LiP(SiMe 3) 2.
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