Oligomeric Benzylsulfonium Salts: Facile Benzylation via High-Load ROMP Reagents.

Facile construction of functionalized 4H-chromene via tandem benzylation and cyclization.

A series of functionalized 4H-chromenes have been constructed by using a novel FeCl(3)-catalyzed benzylation-cyclization tandem reaction.

Facile Oxidative Rearrangements Using Hypervalent Iodine Reagents

Aromatic substituents migrate in a novel oxidative cyclization mediated by iodine(III) reagents. 4-Arylbut-3-enoic acids are cyclized and rearranged to 4-arylfuran-2(5H)-ones by hypervalent iodine compounds in good to excellent yields under mild reaction conditions. Other ring sizes are also accessible. The mechanism of the reaction is described in detail, and calculations highlight the cationi...

Dudley Benzylation Reagent Trichloroacetimidate Reagents (2-trimethylsilyl)- Ethanesulfonyl Reagents Ethynylnaphthalenes Fluorous Protecting Groups Common Reagents for Protection Common Reagents for Deprotection

Synthesis of fluorene-based oligomeric organoboron reagents via Kumada, Heck, and Stille cross-coupling reactions.

Boronic pinacol ester group is not reactive in Kumada, Heck and Stille coupling reaction conditions. Fluorene-based sophisticated organoboron compounds were synthesized by means of Palladium catalyzed Kumada, Heck and Stille cross-coupling reactions from halofluorenyl boronic esters.

Branched Polymers via ROMP of Termimers.

Today's olefin metathesis catalysts show high reactivity, selectivity, and functional group tolerance and allow the design of new syntheses of precisely functionalized polymers. Here the synthesis of a new end-capping reagent is investigated allowing the introduction of a highly reactive activated ester end-group at the polymer chain end as well as its prefunctionalization to directly introduce...