Mechanochemistry is the branch of chemistry in which mechanical forces are used to initiate chemical transformations. These forces can of course be compressive, and indeed the connection between mechano-and high-pressure chemistry has been pointed out. However, while ab initio simulation methods have been developed that apply stretching forces on molecules by constraining coordinates during geometry optimizations or by adding stretching potentials to the electronic energy, only in recent years the quantum mechanochemistry community started to investigate compression forces in more detail.