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Cyclic Disilylated and Digermylated Germylenes.


ABSTRACT: The preparation of triethylphosphine adducts of cyclic disilylated or digermylated germylenes was achieved by reaction of 1,4-dipotassio-1,1,4,4-tetrakis(trimethylsilyl)tetramethyltetrasilane with GeBr2·(dioxane) and PEt3. Phosphine abstraction with B(C6F5)3 allowed formation of the base-free germylenes, which undergo 1,2-trimethylsilyl shifts to the germylene atom to form the respective silagermene or digermene, which further dimerize in [2 + 2] cycloadditions to tricyclic compounds. The reasons responsible for the germylenes' completely different reactivities in comparison to the previously studied analogous stannylenes and plumbylenes were elucidated in a theoretical study.

SUBMITTER: Hlina J 

PROVIDER: S-EPMC3714166 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature

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Cyclic Disilylated and Digermylated Germylenes.

Hlina Johann J   Baumgartner Judith J   Marschner Christoph C   Albers Lena L   Müller Thomas T  

Organometallics 20130529 11


The preparation of triethylphosphine adducts of cyclic disilylated or digermylated germylenes was achieved by reaction of 1,4-dipotassio-1,1,4,4-tetrakis(trimethylsilyl)tetramethyltetrasilane with GeBr<sub>2</sub>·(dioxane) and PEt<sub>3</sub>. Phosphine abstraction with B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> allowed formation of the base-free germylenes, which undergo 1,2-trimethylsilyl shifts to the germylene atom to form the respective silagermene or digermene, which further dimerize in [2  ...[more]

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