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The red-orange tetrasilacyclobutene 1 (R*=SitBu ) is formed quantitatively by the reaction of tetrasilatetrahedrane 2 and iodine. Surprisingly, water and methanol do not react with 1 with addition to the Si-Si double bond, but instead with replacement of the silicon-bound iodine atoms with oxygen or the methoxy group, respectively. The substitutions possibly proceed by dissociative activation via intermediate 3.

The y-rays following the radioactive decay of 16~ into 16~ have been studied. The Lu source was produced in the 144Sm(19F, 3n) reaction at 85 MeV. Excitation functions, half-lives, 7-Y and y-X-ray coincidences and conversion electrons were measured. Two /3 + decaying states in 16~were found with half-lives of 36.2(3)s and 40(1)s. 16~ levels deduced from the decay of 16~ are presented.

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Das orangerote Tetrasilacyclobuten 1 (R*=SitBu3) entsteht quantitativ aus dem Tetrasilatetrahedran 2 und Iod. Wasser und Methanol reagieren mit 1 überraschenderweise nicht unter Addition an die Si‐Si‐Doppelbindung, sondern unter Ersatz der siliciumgebundenen Iodatome gegen Sauerstoff bzw. die Methoxygruppe. Möglicherweise verlaufen die Substitutionen dissoziativ aktiviert über das Zwischenprodukt 3.

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