Disilynes. III [1] A Relatively Stable Disilyne RSi?SiR (R = SiMe(SitBu3)2)

Autor: Gerd Fischer, Nils Wiberg, Peter Mayer, S. K. Vasisht
Rok vydání: 2004
Předmět:
Zdroj: Zeitschrift f�r anorganische und allgemeine Chemie. 630:1823-1828
ISSN: 1521-3749
0044-2313
Popis: The disilyne R**Si≡SiR** (R** = SiMe(SitBu3)2), prepared as the first isolable and realtively stable silicon compound with a SiSi triple bond two years ago by dehalogenation of trans-R**ClSi=SiClR** with LiC10H8 in thf at -78 °C (calc.: Si≡Si distance 2.072A, Si-Si≡Si bond angle 148°), forms with CH2=CH2 a [2+2] and with CH2=CH-CH=CH2 a [2+4] cycloadduct. The ethene adduct takes up oxygen very easily with change of the Si=Si group into a SiOSiO ring with formation of R**Si(μ-O)(μ-O)(μ-C2H4)SiR**. By heating the disilyne in heptane to ca. 50 °C in the presence of traces of thf it transforms into a monoxide of the ethene adduct with formation of R**Si(μ-O)(μ-C2H4)SiR**. In thf, the disilyne rearranges at r.t. and below by migration of a SitBu3 group with formation of a silyl substituted cyclotrisilene. X-ray structure determinations of the ethene adduct and its mono- and dioxide are presented.
Databáze: OpenAIRE
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