Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture: Iron-Catalyzed Aryl–Aryl Cross-Couplings with Magnesium-Derived Copper Reagents (Angew. Chem. Int. Ed. 11/2005)
Aryl–aryl cross-couplings are among the most important C-C bond-forming reactions. Catalysts for this reaction tend to be expensive (Pd) or toxic (Ni). Fe salts are not usually employed as they promote homocoupling of the aryl magnesium reagent. In their Communication on page 1654 ff., P. Knochel and co-workers report an efficient and environmentally benign [Fe(acac)3]-catalyzed cross-coupling of organocopper species ArCu(CN)MgCl with aryl iodides to give a wide range of polyfunctional biphenyl compounds in 50–93 % yield.
Also of Interest
In their Review on page 1602 ff., D. J. Ramón and M. Yus discuss asymmetric multicomponent reactions, through which chiral compounds can be obtained from three or more reactants that are added simultaneously.
In their Communication on p. 1636 ff., H.-A. Wagenknecht, T. Fiebig, and co-workers describe investigations of reductive DNA electron transfer. With modified DNA duplexes they observed a range of electron-transfer rates.
H. Braunschweig et al. present the first “naked” boron atom to linearly bridge two metal centers (Fe/Fe or Fe/Cr) in their Communication on page 1658 ff.