| Abstract: | Extension of the Chain Length of P2(SiMe3)4 by Reaction with LiBu The first steps of the reaction of P2(SiMe3)4 1 with LiBu in THF, which finally yields Li3P7 among other P-rich phosphides while P(SiMe3)3 and LiP(SiMe3)2 are simultaneously split off, were investigated by means of 31P-NMR spectroscopy. At ?20°C first of all one Si? P bond is cleaved generating Li(Me3Si)P? P(SiMe3)2 2 as well as BuSiMe3. Subsequently 2 forms Li(Me3Si)P? P(SiMe3)? P(SiMe3)2 5 and LiP(SiMe3)2 4 in equimolar ratios. This clearly demonstrates that both compounds are generated in one single reaction step. This behaviour is caused by the different basicity of the respective P-atoms in 2 , which necessarily results in a multicentered mechanism. |
