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Cover Picture Heterolytic Dihydrogen Activation by a Frustrated CarbeneЦBorane Lewis Pair Hydrogen and Amine Activation by a Frustrated Lewis Pair of a Bulky N-Heterocyclic Carbene and B(C6F5)3 (Angew. Chem. Int. Ed. 392008)

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D 3461
International Edition
Metalated Porphyrins
R. J. M. Klein Gebbink and B. M. J. M. Suijkerbuijk
M. Mavrikakis and L. C. Grabow
Radical Ligands
R. G. Hicks
ACIEFS 47 (39) 7369–7564 (2008) · ISSN 1433–7851 · Vol. 47 · No. 39
Cover Picture
Dirk Holschumacher, Thomas Bannenberg, Cristian G. Hrib,
Peter G. Jones, Matthias Tamm,*
Preston A. Chase, and Douglas W. Stephan*
Forcing a square peg into a round hole:
tBu2ImCD and B(C6F5)3 form a frustrated Lewis pair (FLP), allowing the synergistic
activation of H2. On page 7428 ff., M. Tamm et al. describe how the irreversible
formation of an abnormal carbene–borane adduct eliminates mismatching between
acid and base so that this system can circumvent frustration at the expense of activity.
In addition, D. W. Stephan and P. A. Chase demonstrate on page 7433 ff. that this
FLP combination not only effects heterolytic cleavage of H2, but also of amine N H
Bifunctional Cyclopropane Derivatives
In their Communication on page 7424 ff., H. Ito, M. Sawamura et al. describe the
regio- and enantioselective copper-catalyzed synthesis of boron–silicon bifunctional
cyclopropane derivatives from silylated allylic carbonates and a diboron species.
Metalated Porphyrins
The Review by R. J. M. Klein Gebbink and B. M. J. M. Suijkerbuijk on page 7396 ff.
gives an overview of the diverse nature of metalated porphyrins. The spectrum ranges
from reactive intermediates to dyads and triads for photochemical change separation.
Cyclic Heteroallenes
A. Baceiredo, G. Bertrand et al. describe in their Communication on page 7530 ff.
the isolation of a cyclic five-membered vinylidenephosphorane that is stable at
room temperature. This strongly electron-donating ligand gives rise to very robust
transition-metal complexes.
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hydrogen, carbene, amin, activation, c6f5, heterolytic, int, cover, angel, chem, frustrated, pairs, picture, heterocyclic, 392008, lewis, dihydrogen, bulka, carbeneцborane
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