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Cover Picture Asymmetric Intramolecular Crossed-Benzoin Reactions by N-Heterocyclic Carbene Catalysis (Angew. Chem. Int. Ed. 92006)

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Cover Picture
Dieter Enders,* Oliver Niemeier, and Tim Balensiefer
Enantioselective intramolecular crossed-benzoin reactions can be effected by using
chiral N-heterocyclic carbene catalysts. The tetracyclic chiral carbene catalyst shown
in the cover picture enables the reaction to proceed with formation of only one
enantiomer of the a-hydroxy-substituted tetralones. D. Enders and co-workers
disclose the development of the quaternary stereocenters in the organocatalytic
reaction in their Communication on page 1463 ff.
DNA Structures
The local conformation in DNA governs the abstraction of hydrogen through uracil-5yl radicals. How this principle is used to analyze DNA structures is shown by H.
Sugiyama and Y. Xu in their Minireview on page 1354 ff.
In their Review on page 1364 ff., S. E. Gibson and C. Lecci take a closer look at
amino acid derived macrocycles. How advanced is their synthesis? What are the
applications of these compounds?
Liquid Crystals
The photoresponsive behavior of liquid-crystalline elastomer films with different types
of mesogen alignment is discussed by T. Ikeda and co-workers in their
Communication on page 1378 ff.
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asymmetric, intramolecular, reaction, carbene, 92006, int, cover, angel, chem, catalysing, benzoin, crosses, picture, heterocyclic
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