Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture: A Dinuclear, Triple-Stranded Helicate with a Diamide-Bridged Catechol/Benzenedithiol Ligand (Angew. Chem. Int. Ed. 36/2004)
Helices are a universal structure. They are found in all sizes from molecular species to spiral nebula. The cover picture shows a dinuclear, triple-stranded helicate containing a novel ligand with a catecholato and an o-benzenedithiolato donor group. Only the regioisomer with a parallel orientation of the ligands is formed and from only one pair of enantiomers. For more information, see the Communication by F. E. Hahn et al. on page 4807 ff.
Also of Interest
P. Espinet and A. M. Echavarren have gone through the mechanism of the Stille coupling reaction with a fine-tooth comb. See their Review on page 4704 ff. to find out which factors determine the intermediates formed in the individual reaction steps.
Tetrathiafulvalene acts as a leaving group in the oxidative cyclization reactions leading to a new bithiazole-type ring assembly. The synthesis and properties of this heterocycle are described by S. Decurtins and co-workers on page 4738 ff.
Nanomechanical DNA Devices
Nanomechanical devices are promising probes for performing measurements at the molecular level. N. C. Seeman and co-workers explain on page 4750 ff. the structure and function of a “DNA machine” obtained by linking two triple-helical DNA motifs with a shaft of conventional DNA.