IUPAC definition : a chemical reaction or transformation of the general type: in which the connecting
atom or group y replaces the bond joining the parts x and z of the reactant xz. an
example is the carbene insertion reaction: the reverse of an insertion is called an
extrusion.;
a chemical reaction or transformation of the general type: in which the connecting
atom or group y replaces the bond joining the parts x and z of the reactant xz. an
example is the carbene insertion reaction: the reverse of an insertion is called an
extrusion.