Sascha Schäfer

A Versatile and Highly Reactive Polyfluorinated Hypervalent Iodine(III) Compound

Hyper-reactive: A highly reactive, fully fluorinated hypervalent iodine reagent (see formula) mediates new transformations (e.g. the one-pot conversion of sulfides to sulfoximines) and serves as a stoichiometric oxidant in well-established reactions (e.g. C–C bond cleavage and the conversion of alcohols into aldehydes).

Gold Catalysis: Non-Spirocyclic Intermediates in the Conversion of Furanynes by the Formal Insertion of an Alkyne into an Aryl–Alkyl CC Single Bond

It takes al-kynes: The formation of furyl-substituted heterocycles from furanynes with donor groups on the furan-alkyne tether and mechanistic control experiments indicate the involvement of open-chained carbenium ions in the overall insertion of an alkyne into a C-C bond, rather than the usual spirocyclic intermediates.

Iodoxolone-Based Hypervalent Iodine Reagents

The fast access to simple (Z)-3-iodo acrylic acid derivatives which can be easily oxidized to the corresponding hypervalent iodine(III) reagents is described. They can be used for various reactions with superior or similar reactivity as conventional hypervalent iodine(III) reagents.

Gold Catalysis: AuCl-induced Polymerization of Styrene and n-Butylvinylether

Polymerization of styrene, 4-methoxystyrene, and n-butylvinylether was achieved using simple AuCl as catalyst and AgPF6 as cocatalyst. High molecular weights and low polydispersity indices were obtained. Evidence for a cationic mechanism was obtained by reactions with nucleophiles. The mechanistic study also indicates a living polymerization with the gold(i)–alkene complex as the resting species.

Gold catalysis: News from the homogeneous wing

Phenol synthesis using a homogeneous gold catalyst serves as an example of the tremendous progress in homogeneous catalysis by gold which has been made in the past few years. Various aspects of this reaction, including catalyst selectivity and activity and the simple conditions used are described; and the mechanism is discussed in this context.

Crystal structure of ethyl 2,3,4-tri-o-acetyl- 1-thio-a-L-rhamnopyranoside, C14H22O7S

C14H22O7S, orthorhombic, P2i2i2i (no. 19), a = 9.573(2) Â, b = 13.395(3) Â, c = 13.708(3) Â, V= 1757.8 À, Ζ = 4, RgJF) = 0.058, wtfreffF) = 0.139, Τ = 293 Κ.