Cyclotrisilanes and Related Compounds

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Abstract
Cyclotrisilanes are easily obtained by reductive halogen elimination from sterically congested dihalomono-dihalodi-, or dihalotrisilanes. Ring contraction of cyclotetrasilanes containing medium-sized substituents also provides access to the three-membered cycles. Their molecular structures reveal considerable lengthenings of the Si-C and mainly the Si-Si bonds. The photochemically induced ring cleavage leads to the corresponding disilenes or to silylenes and disilenes which can either be isolated or trapped by a variety of multiply-bonded compounds. Cyclotrigermanes and cyclotristannanes, which can be obtained by a similar route, can also be cleaved to yield digermenes and distannenes, respectively.