[1] The molecule possesses approximately C2 symmetry and the mesityl groups are twisted by 54.2°.

The bulky mesityl groups cause steric strain which is reduced by increase in R1–C–R2 angle from 117° in dioxirane to 119.2° in dimesityldioxirane.

The mesityl groups also rotate about the single bond, consequently reducing steric repulsions further.

[2] Dimesityldioxirane was first isolated at room temperature in pure as well as in solution form in 1994.

[3] It was synthesised by irradiation of its diazo derivative in trichlorofluoromethane at 183K to form dimesitylcarbene, followed by oxidation.