Cover Picture: A Cyclic Silylone (“Siladicarbene”) with an Electron-Rich Silicon(0) Atom (Angew. Chem. Int. Ed. 28/2013)

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Abstract

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A rare pearl of a neutral silicon atom in the formal oxidation state zero seems to evolve best in the oyster-like coordination environment of a bidentate N-heterocyclic carbene ligand. In their Communication on page 7147 ff., M. Driess and co-workers present the strikingly facile formation of this silicon pearl, which belongs to the novel class of theoretically predicted compounds termed silylones. (Graphics: Wernerwerke.)

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A rare pearl of a neutral silicon atom in the formal oxidation state zero seems to evolve best in the oyster-like coordination environment of a bidentate N-heterocyclic carbene ligand. In their Communication on page 7147 ff., M. Driess and co-workers present the strikingly facile formation of this silicon pearl, which belongs to the novel class of theoretically predicted compounds termed silylones. (Graphics: Wernerwerke.)

As–N Triple Bonds

More than 150 years after the discovery of stable diazonium salts, a heavy arsenic analogue has been isolated. In their Communication on page 7126 ff., A. Schulz et al. describe the electronic structure of arsa-diazonium salts and their use in 3+2 cycloaddition reactions.

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From CO to C2. By using DFT calculations, F. Calle-Vallejo and M. T. M. Koper elucidate a mechanism for the electroreduction of CO to C2 species on Cu(100) in their Communication on page 7282 ff. They also show why the process is pH-independent.

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Universal Antigen

The O-antigen of infectious Brucella bacteria can be in either A- or M-antigenic forms. In their Communication on page 7181 ff., D. R. Bundle et al. describe a nonasaccharide glycoconjugate that encompasses both antigenic features.

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Ancillary