Abstract
AbstractWhen Si8R*6 (R* = Si(tBu)3) is reacted with mild halogenation reagents like carbon tetrachloride, carbon tetrabromide, tin tetrachloride and iodine, new compounds are formed which besides the Si(tBu)3 groups have halide ligands and a silicon‐silicon back‐bone which is either cyclic, bicyclic or polycyclic. We here report on the molecular and crystal structures of four derivatives: Si5R*3Cl5 (9), Si4R*3Br5 (10), Si8R*4Cl6 (11) and Si8R**3I11 (12). The molecule 9 has a bicyclic silicon back‐bone with a three‐ and four‐membered cycle sharing one edge, 10 is monocyclic with a four membered silicon‐silicon‐ring, 11 is polycyclic and can be derived from a Si8‐cube and 12 is bicyclic with a four‐ and five‐membered silicon ring sharing one edge.We also propose some possible reaction mechanisms which follow from observations found during our experiments.
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