Synthesis, Structure, and Stability of Adducts between Phosphide and Amide Anions and the Lewis Acids Borane, Tris(pentafluorophenyl)borane, and Tris(pentafluorophenyl)alane
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- 作者：Anna-Marie Fuller ; Andrew J. Mountford ; Matthew L. Scott ; Simon J. Coles ; Peter N. Horton ; David L. Hughes ; Michael B. Hursthouse ; Simon J. Lancaster
- 刊名：Inorganic Chemistry
- 出版年：2009
- 出版时间：December 7, 2009
- 年：2009
- 卷：48
- 期：23
- 页码：11474-11482
- 全文大小：1008K
- 年卷期：v.48,no.23(December 7, 2009)
- ISSN：1520-510X
文摘
The phosphinoborane adduct H3P·B(C6F5)3 can be deprotonated using LiN(SiMe3)2 to give the phosphidoborate salt Li[H2PB(C6F5)3], which was converted to the phosphidodiborates Li[H2P{B(C6F5)3}2] and Li[H2P{B(C6F5)3}{BH3}] by treatment with an equivalent of B(C6F5)3 or Me2S·BH3, respectively. A series of anions of the form [RR′P{M(C6F5)3}{BH3}]−, where R = R′ = Ph or R= tBu, R′ = H, and M = B or Al, were prepared (through treatment of salts Li[RR′P(BH3)] with the corresponding Lewis acid) and characterized using multinuclear NMR, elemental analysis and X-ray crystallography. The solid state structures of [Li(Et2O)x][Ph2P{M(C6F5)3}{BH3}] exhibit η2-bonding of the BH3 group to the cationic lithium center. The attempted preparation of an analogous series with amide cores of the form [R2N{B(C6F5)3}{BH3}]− proved unsuccessful; among the competing reaction pathways hydride abstraction occurred preferentially to yield Li[HB(C6F5)3] and dimers or higher oligomers with the composition (R2NBH2)n.