Dodecamethylcyclohexasilane undergoes ring contraction with aluminium chloride as catalyst in the presence or absence of trimethylchlorosilane to give, respectively, chlorodimethylsilyl- or trimethylsilyl-cyclo-pentasilane, the former being convertible into monofunctional nonamethylcyclopentasilanes.
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Ishikawa et al. (1969) studied this question.