Manganese(III) Triacetate-Mediated Cross Coupling of Organoboron Compounds with Trichloroethylene (TCE): Synthesis of 1,1-Dichloroalkenes

Herein, we report an efficient method for the synthesis of 1,1-dichloroalkenes from organoboron compounds. This reaction proceeds in the presence of manganese(III) triacetate using trichloroethylene (TCE) as the vinylation reagent. This reaction can tolerate various types of organoboron compounds and various functional groups. The yields are moderate to good. Surprisingly, this transformation could even be achieved in the presence of manganese(II) acetate. Furthermore, this synthetic strategy could be applied to the synthesis of 1,1,2-trichloro-, 1-chloro-, and 2-chloroalkenes.

Transition Metal-Catalyzed Transformations of Chalcones

Chalcones are a class of naturally occurring flavonoid compounds associated to a variety of biological and pharmacological properties. Several reviews have been published describing the synthesis and biological properties of a vast array of analogues. However, overviews on the reactivity of chalcones has only been explored in a few accounts. To fill this gap, a systematic survey on the most recent developments in the transition metal-catalyzed transformation of chalcones was performed. The chemistry of copper, palladium, zinc, iron, manganese, nickel, ruthenium, cobalt, rhodium, iridium, silver, indium, gold, titanium, platinum, among others, as versatile catalysts will be highlighted, covering the literature from year 2000 to 2023, in more than 380 publications.

Oxidative Radical Transnitrilation of Arylboronic Acids with Trityl Isocyanide

We report a radical transnitrilation of arylboronic acids with trityl isocyanide in the presence of manganese(III) acetate. Many functional groups can be tolerated in this transformation, and a special positive effect of benzoic acid in this reaction has been observed.