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Issue 19, 2014
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Reactivity studies of a soluble LiH-complex and non-spectator behaviour of its stabilising phosphinoamide ligand

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Abstract

We have investigated and compared the reactivity of the phosphinoamide stabilized hydrocarbon-soluble LiH complex [(LLi)4(LiH)4] 1 (L = [Ph2PNDip], Dip = 2,6-iPr2C6H3) and the lithium phosphinoamide [LLi] 2 towards some unsaturated organic substrates. The complexes [(LSiMe2OLi)2(HDCCLi)2] 3 (DCC = CyNCNCy, Cy = cyclohexyl) and [(HDCC)6Li8O] 4 were obtained from reactions of 1 with DCC, and the complexes [{LN(Ph)N(Ph)Li}2] 5 and [{PhN(Li)–N(Li)Ph}4] 7 were obtained from reactions of 1 with azobenzene. Complex 5 was furthermore obtained in good yield from 2 and azobenzene, and was converted to the solvate [LN(Ph)N(Ph)Li(THF)] 6. Complex 7 could be independently synthesized from lithium metal and azobenzene. Complex 1 undergoes hydrolithiation reactions with some substrates, as evidenced by the formation of complexes 3, 4, and indirectly by 7, but also takes part in addition reactions of the stabilizing phosphinoamide ligand onto substrates as shown by the isolation of complexes 3 and 5. The crystal structures of complexes 3, 5, 6, 7 and [LLi(THF)3] are reported.

Graphical abstract: Reactivity studies of a soluble LiH-complex and non-spectator behaviour of its stabilising phosphinoamide ligand

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Supplementary files

Article information


Submitted
06 Aug 2013
Accepted
25 Feb 2014
First published
26 Feb 2014

Dalton Trans., 2014,43, 7078-7086
Article type
Paper
Author version available

Reactivity studies of a soluble LiH-complex and non-spectator behaviour of its stabilising phosphinoamide ligand

A. Stasch, Dalton Trans., 2014, 43, 7078
DOI: 10.1039/C3DT52140K

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