A palladium(ii)-catalyzed hydroboration of aryl alkenes with stable and easy-to-handle (pinacolato)diboron (Bpin) under mild conditions has been developed. Acetic acid acted as the solvent and the hydrogen source, which has been identified by deuterium experiments. Notably, isomerization-hydroboration of allyl benzene derivatives was observed. As a result, a series of benzyl boronic esters were obtained in moderate to excellent yields with exclusive regioselectivity.

A novel palladium-catalyzed alkene diacetoxylation with dioxygen (O) as both the sole oxidant and oxygen source is developed, which was identified byO-isotope labeling studies. Control experiments suggested that bis(pinacolato)diboron (Bpin) played a dominant intermediary role in the formation of a C-O bond. This method performed good functional group tolerance with moderate to excellent yields, which could be successfully applied to the late-stage modification of natural products. Furthermore, an atmospheric pressure of dioxygen enhances the practicability of the protocol.

An unprecedented multicomponent reaction involving arynes, allyl bromides, and CO2 has been developed to construct various allyl o-bromobenzoate scaffolds.

An efficient method for the synthesis of (E)-β-aryl sulfonyl acrylates has been reported. This palladium-catalyzed approach showed excellent regio-and stereoselectivity in the sulfonylation of aryl propiolates with sulfonyl hydrazides. Through this approach, a wide range of (E)-β-aryl sulfonyl acrylates were obtained in moderate to high yields. Scheme 3. Substrate scope of sulfonyl hydrazides. [a] Scheme 4. Mechanistic studies. Scheme 5. Plausible mechanism.

Design and fabrication of multi-block anion exchange membranes with fluorene-containing hydrophilic segments densely functionalized by side-chain quaternary ammonium groups.