Triarylamminium Radical Cation Facilitates the Deprotection of tert-Butyl Groups in Esters, Ethers, Carbonates, and Carbamates

Mechanochemical deprotection of t-butoxycarbonyl (Boc) group using basic alumina

A solvent-free, operationally simple, and chemoselective mechanochemical method for t-butoxycarbonyl (Boc) deprotection is described. In a planetary ball mill, N-Boc groups from protected heterocycles, amides, and anilines, as well as O-Boc groups from carbonates, can be removed selectively, using basic alumina. This high-yielding protocol avoids tedious extraction and column chromatography.

Structure-property-function relationships of stabilized and persistent C- and N-based triaryl radicals

Structurally similar C- and N-based triaryl radicals are among the most commonly used structural motifs in stable, open-shell, organic molecules. The application of such species is associated with their stability, properties and structural design. This study summarizes the basic stabilization and persistence principles of C- and N-based triaryl radicals and highlights recent advances in design strategies of radicals tailored for specific applications.