Mechanosynthesis of Sydnone-­Containing Coordination Complexes

<p><i>N</i>-Phenyl-4-(2-pyridinyl) sydnone was shown to act as a four-electron donor <i>N</i>,<i>O</i>-ligand in unprecedented coordination complexes featuring four different metallic centers (Co, Cu, Ni, Zn). Starting from various anilines, the use of ball-mill enabled efficiently the synthesis of <i>N</i>-arylglycines, subsequent nitrosylation and cyclization into sydnone, and further metalation.</p>