Silicenium ions rearrangement

Two major types of rearrangements involving silyl centres have been observed. The first involves interaction of a silicenium ion centre, formed by loss of a substituent from silicon in the molecular ion, with distant electron-rich centres in the molecule. The second type, which will be discussed in Section III.B, involves direct transfer of an intact silyl group (such as trimethylsilyl) from one part of the ion to another. Both rearrangement processes may then be followed by unimolecular dissociations. 

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