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Cover Picture Pd-Catalyzed -Arylation of Trimethylsilyl Enol Ethers with Aryl Bromides and Chlorides A Synergistic Effect of Two Metal Fluorides as Additives (Angew. Chem. Int. Ed. 352006)

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Cover Picture
Weiping Su, Steven Raders, John G. Verkade,* Xuebin Liao, and
John F. Hartwig*
A synergistic combination of two metal fluoride additives is the key to the palladiumcatalyzed coupling of aryl halides with silyl enol ethers. In their Communication on
page 5852 ff., J. G. Verkade, J. F. Hartwig, and co-workers discuss the use of this
approach to prepare a-aryl ketones from both cyclic and acyclic silyl enol ethers and
a wide range of aryl bromides and chlorides. The cover picture depicts the difference
in the yields from reactions with one and with two additives.
Octacyclene Synthesis
The construction of eight-membered rings is synthetically demanding. Ring-closing
metathesis can be the key to success, as J. Rodriguez and A. Michaut describe in their
Minireview on page 5740 ff. with its application to the synthesis of octacyclenes.
Leuchs-s anhydrides, a-amino acid N-carboxyanhydrides, have been used to
synthesize peptide block copolymers and liquid-crystalline polypeptides through ringopening polymerization. In the Review on page 5752 ff., H. R. Kricheldorf discusses
new developments and the application of polypeptides as drug carriers.
Spin-Crossover Materials
In their Communication on page 5786 ff., A. Bousseksou, G. Moln3r et al. describe a
successful multilayer assembly of [Fe(pyrazine){M(CN)4}] (M ¼ Ni, Pd, or Pt) thin
films, which display spin-crossover phenomenon and provide a novel platform for the
construction of devices.
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two, enol, chloride, aryl, bromide, catalyzed, trimethylsilyl, int, effect, cover, angel, synergistic, fluoride, ethers, chem, metali, arylation, picture, additive, 352006
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