Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture: A Convergent Route to Enantiomerically Pure Higher [n−2]Triangulanedimethanol Derivatives and [n]Triangulanes (n≥7) (Angew. Chem. Int. Ed. 47/2004)
The rigid helical frameworks of the molecules of (M)-(−)-triangulane-1,9-dimethanol associate through hydrogen bonds between their terminal hydroxy groups in supramolecular helices, two of which form a supramolecular double helix. In the cover picture, this is compared with the design by Leonardo da Vinci of a double-spiral staircase. The hydrocarbon (M)-(−)-triangulane does not organize itself as a supramolecular double helix. For more information see the Communication by de Meijere et al. on page 6553 ff. The cover picture was created by Dipl.-Chem. Heiko Schill.
Also of Interest
History of Science
The 100th anniversary is commemorated of the awarding of the Nobel Prize to Lord Rayleigh and Sir Ramsay for their discovery and characterization of the noble gases. J. M. Thomas describes in his Essay on page 6418 the important stages in the lives of these two great scientists.
In vitro and in vivo incorporation of noncanonical amino acids using an expanded genetic code and the perspectives of this method for the synthesis of tailor-made proteins are discussed in the Review by N. Budisa on p. 6426 ff.
Removal of the coil segments from an ordered rod–coil compound with a honeycomb-like structure to give a perforated crystalline sheet of hexagonally ordered nanopores is described by M. Lee and co-workers in their Communication on page 6466 ff.