A Cyclic Germadicarbene (“Germylone”) from Germyliumylidene

Abstract

By employing the chelate dicarbene <b>1</b>, the new chloro­germylium­ylidene complex <b>2</b> could be synthesized and isolated in 95% yield. Dechlorination of <b>2</b> with sodium naphthalenide furnishes the unique cyclic germadicarbene <b>3</b> which could be isolated in 45% yield. Compound <b>3</b> 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 <b>3</b> with two lone pairs of electrons at the Ge atom