Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 31

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPhotoChem, ChemPlusChem, Zeitschrift für Chemie

50_07/2011Cover Picture: The Catalytic Asymmetric Knoevenagel Condensation (Angew. Chem. Int. Ed. 7/2011)

The annual rings of the pictured tree represent the time gap, 116 years, between the discovery of the Knoevenagel condensation and that of the first catalytic asymmetric variant. As described by B. List et al. in their Communication on page 1707 ff., a cinchona amine catalyst promotes the reaction of α-branched aldehydes and malonates through a dynamic kinetic resolution to give alkylidene malonates with high enantioselectivity.

Read Full Text  | Table of Contents

Also of Interest

Responsive Photonic Crystalsfor001

Responsive photonic crystals can respond to different stimuli and have manifold applications. In their Review on page 1492 ff., Y. Yin and J. Ge explain how to prepare and condition such crystals for specific purposes.

Coordination Chemistryfor002

D. Armspach, D. Matt, and co-workers describe in their Communication on page 1554 ff. how attaching an unsymmetrical diphosphine to a β-cyclodextrin cavity led to it oscillating about a metal center while remaining chelated.

Magnetic Propertiesfor003

In their Communication on page 1573 ff. J. L. Manson et al. present the coordination polymer [Cu(HF2)2(pyz)]n. They show that spin exchange through Cu-(FHF)2-Cu bridges is about 90 % stronger than through Cu-pyz-Cu bridges.