Supersilyliertes Ethen trans-(tBu3

Supersilyliertes Ethen trans- ( t Bu

Si)HC=CH(Si t Bu

) und Ethin ( t Bu

Si)C

C(Si t Bu

)

Supersilylated Ethenetrans-(tBu₃Si)HC=CH(SitBu₃) and Ethyne (tBu₃Si)C≡≡≡C(SitBu₃) Hannes Vitze^a, Ulrich Wietelmann^b, Alexander Murso^b, Michael Bolte^a, Matthias Wagner^a und Hans-Wolfram Lerner^a

aInstitut f¨ur Anorganische Chemie, Goethe-Universit¨at Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany

bR&D Lithium Division Chemetall GmbH, Trakehner Str. 3, 60487 Frankfurt am Main, Germany Reprint requests to Dr. Hans-Wolfram Lerner. Fax: ++49-69-79829260.

E-mail: lerner@chemie.uni-frankfurt.de

Z. Naturforsch.2009,64b,223 – 228; received October 31, 2008

The supersilylated ethene trans-(tBu3Si)HC=CH(SitBu3) (triclinic, P¯1) is accessible from the reaction of tBu₃SiCHBr₂ with nBuLi at −78 ^◦C in THF or Et₂O. The reaction of Li(H2NCH2CH2NH2)C≡CH with tBu3SiBr leads to the formation of (tBu3Si)C≡CH and (tBu₃Si)C≡C(SitBu₃). X-Ray quality crystals of (tBu₃Si)C≡C(SitBu₃) (triclinic,P¯1) were obtained by recrystallization from hexane. In contrast to the structures of the disilanetBu3Si-SitBu3 and the disiloxanetBu3Si–O–SitBu3, the sterically crowded ethenetrans-(tBu3Si)HC=CH(SitBu3) and ethyne (tBu₃Si)C≡C(SitBu₃) feature dihedral angles of 60^◦in the solid-state structures.

Key words:Ethene, Ethyne, Supersilyl, Carbene, Crystal Structure Analysis