Beiträge zur Chemie des Phosphors. 203 [1].(t- BuSi)4P3Cl3, das erste Silaphosphan mit Norcuban-Struktur |
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Authors: | M Baudler G Scholz K-F Tebbe |
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Abstract: | Contributions to the Chemistry of Phosphorus. 203. (t-BuSi)4P3Cl3 – The First Silaphosphane with a Structure Analogous to Norcubane The reaction of t-BuSiCl3 with LiAl(PH2)4 yields the compound (t-BuSi)4P3Cl3 ( 1 ), which has been isolated in pure form. According to NMR spectroscopic investigations and an X-ray single-crystal analysis, 1 is 2,4,6,7-tetra-tert-butyl-2,4,7-trichloro-1,3,5-triphospha-2,4,6,7-tetrasilatricyclo3.1.1.03,6]heptane and thus the first silaphosphane with a structure analogous to norcubane. The compound crystallizes monoclinically in the space group P21/n with a = 1102.1 pm, b = 1609.2 pm, c = 1612.8 pm, β = 90.90° and Z = 4. The main structural feature is a cube alternately composed of Si and P, from which one phosphorus atom has been removed. The Si atoms are each substituted by t-Bu groups, the three adjacent to the missing corner additionally by Cl atoms. |
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