https://doi.org/10.1351/goldbook.E02311
A
or
The reverse of an extrusion is called
transformation
in which an atom or group Y connected to two other atoms or groups X and Z is lost from a molecule, leading to a product in which X is bonded to Z, e.g. ![Not defined](/img/inline/E02311-1.png)
![Not defined](/img/inline/E02311-2.png)
insertion
.See:
cheletropic reaction
, insertion
, transformation