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Cover Picture Direct Decomposition of Nitrous Oxide to Nitrogen by InSitu Oxygen Removal with a Perovskite Membrane (Angew. Chem. Int. Ed. 162009)

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D 3461
International Edition
www.angewandte.org
2009–48/16
Redox Economy
P. S. Baran, R. W. Hoffmann, N. Z. Burns
Artificial Photosynthesis
A. Llobet et al.
Highlights: [2+2+2] Cycloadditions · Perfluorinated Boranes ·
Helical Structures
ACIEFS 48 (16) 2807–2992 (2009) · ISSN 1433–7851 · Vol. 48 · No. 16
Cover Picture
Heqing Jiang, Haihui Wang,* Fangyi Liang, Steffen Werth,
Thomas Schiestel, and Jrgen Caro*
Hollow fiber membranes from mixed-conducting perovskites can separate oxygen
selectively from gas mixtures. Wall thicknesses as low as 150 mm can be obtained by a
wet spinning process, and oxygen fluxes are thereby obtained that are relevant for
technical applications. In their Communication on page 2983 ff., H. Wang, J. Caro and
co-workers describe the complete decomposition of nitrous oxide with such
membranes. This method offers new opportunities to reduce emissions of this
greenhouse gas.
Artificial Photosynthesis
The use of molecular complexes as catalysts for the oxidation of water is discussed
by A. Llobet and co-workers in their Minireview on page 2842 ff. Initial attempts to
generate supported molecular catalysts for this reaction are also presented.
Synthesis Planning
In their Review on page 2854 ff., P. S. Baran, R. W. Hoffmann, and N. Z. Burns
discuss an often-overlooked form of synthetic economy, namely redox economy: the
use of as few redox steps as possible in the synthesis of a target molecule. Guidelines
are given as to how the redox economy in multistep synthetic sequences can be
improved.
Tandem Reactions
X. Xu, Q. Liu and co-workers show in their Communication on page 2868 ff. that
one C N and three C C bonds along with four adjacent stereocenters can be
formed with excellent atom economy in the synthesis of pyrrolizidines.
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decompositions, nitrous, direct, 162009, membranes, int, cover, angel, removal, oxide, chem, nitrogen, perovskite, insitu, picture, oxygen
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