Transition-Metal-Free [3+2] Cycloaddition to Access Tetrazoles: Non-radical Application of Arylazo Sulfones

A transition-metal-free [3+2] cycloaddition between arylazo sulfones and diazo compounds is reported. Notably, arylazo sulfones demonstrate distinct reactivity characteristics; in contrast, other common azo compounds and aryldiazonium salts prove ineffective...