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J Am Chem Soc. 2013 Apr 3;135(13):5004-7. doi: 10.1021/ja402477w. Epub 2013 Mar 25.

A cyclic germadicarbene ("germylone") from germyliumylidene.

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  • 1Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universit├Ąt Berlin , Strasse des 17. Juni 135, Sekr. C2, D-10623 Berlin, Germany.


By employing the chelate dicarbene 1, the new chlorogermyliumylidene complex 2 could be synthesized and isolated in 95% yield. Dechlorination of 2 with sodium naphthalenide furnishes the unique cyclic germadicarbene 3 which could be isolated in 45% yield. Compound 3 is the first isolable Ge(0) complex with a single germanium atom stabilized by a dicarbene. Its molecular structure is in accordance with DFT calculations which underline the peculiar electronic structure of 3 with two lone pairs of electrons at the Ge atom.

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