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Cover Picture Highly Active Chiral Ruthenium-Based Metathesis Catalysts through a Monosubstitution in the N-Heterocyclic Carbene (Angew. Chem. Int. Ed. 232010)

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D 3461
www.angewandte.org
2010–49/23
Ultrasmall-Scale Analysis
H. H. Gorris and D. R. Walt
Hybrid Catalysts
H. Sugiyama and S. Park
Bioinorganic Chemistry
T. Ueno
ACIEFS 49 (23) 3849–3990 (2010) · ISSN 1433–7851 · Vol. 49 · No. 23
Cover Picture
Sascha Tiede, Anke Berger, David Schlesiger, Daniel Rost,
Anja Lhl, and Siegfried Blechert*
One handed is very efficient not only for fiddler crabs, but also for chiral ruthenium
metathesis (pre)catalysts that contain a monosubstituted carbon center in the Nheterocyclic ligand. In their Communication on page 3972 ff. S. Blechert and coworkers show that through the combination of ligands a highly stable catalyst is
formed that rapidly initiates the asymmetric ring-opening cross-metathesis and
delivers high E-isomer selectivity and high enantioselectivity. (Photo: Thorsten
Stegmann.)
Ultrasmall-Scale Analytical Chemistry
The application of femtoliter containers and arrays offers tremendous perspectives
for chemical and biochemical analysis as well as new scientific methods and
insights. A status report on research in this area is given by H. H. Gorris and D. R.
Walt in their Review on p. 3880 ff.
Asymmetric Catalysis
In their Minireview on page 3870 ff., S. Park and H. Sugiyama describe the use of
hybrid catalysts self-assembled from DNA and metal–ligand complexes in highly
enantioselective Lewis acid catalyzed reactions in aqueous media.
Molecular Devices
In their Communication on page 3896 ff., D. A. Leigh, W. J. Buma, and co-workers
describe how hydrogen bonds holding the thread of a rotaxane can be freed by
stepwise microsolvation. The process resembles disengaging a windmill blocked by
its four vanes.
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carbene, 232010, ruthenium, base, chiral, int, cover, angel, monosubstitution, metathesis, chem, activ, picture, heterocyclic, catalyst, highly
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