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Cover Picture Supramolecular Catalysis of a Unimolecular Transformation Aza-Cope Rearrangement within a Self-Assembled Host (Angew. Chem. Int. Ed. 482004)

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Cover Picture
Dorothea Fiedler, Robert G. Bergman,* and Kenneth N. Raymond*
A supramolecular metal–ligand assembly catalyzes the [3,3]-sigmatropic
rearrangement of enammonium guests in aqueous solution. The cover picture shows
the proposed catalytic cycle. The space-restrictive host cavity forces the substrates to
bind in a reactive chairlike conformation and thus accelerates the rate of
rearrangement. Release and hydrolysis of the rearranged product enable catalytic
turnover. For more information, see the Communication by R. G. Bergman, K. N.
Raymond, and D. Fiedler on p. 6748 ff.
Noncovalent Interactions
The affinity of a ligand for its receptor depends both on the coordination itself and
modification of the noncovalent interactions within the receptor. This phenomenon is
described by D. H. Williams et al. in their Review on page 6596 ff.
Polymerization Catalysts
Epoxides and CO2 undergo copolymerization in the presence of well-defined
homogeneous catalysts to produce polycarbonates. The latest developments in this
field are summarized by G. W. Coates and D. R. Moore in their Review on
page 6618 ff.
Water structure
The previous assumption that water adsorbs in a uniform monolayer on the surface of
zinc oxide is disproved by B. Meyer, C. W6ll, and co-workers in their Communication
on page 6641 ff. According to the findings a superstructure is formed that consists of
partially dissociated water molecules.
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