1,3-dipole

A 1,3-dipole is a type of organic compound with a three-atom pi-electron system containing 4 electrons delocalized over three atoms. They are reactants in 1,3-dipolar cycloadditions.

Known 1,3-dipoles:
 * Azides
 * Ozone
 * Nitro compounds
 * Diazo compounds
 * Some oxides
 * Azoxide compounds
 * Carbonyl oxides (see ozonolysis)
 * Nitrile oxides
 * Nitrous oxide
 * Nitrones
 * Some imines:
 * Azomethine imine
 * Nitrilimines
 * Carbonyl imines
 * Some ylides
 * Azomethine ylide
 * Nitrile ylide
 * Carbonyl ylide