Magnesium monoperoxyphthalate (MMPP) is a water-soluble peroxy acid used as an oxidant in organic synthesis.

[1] Due to its insolubility in non-polar solvents MMPP has seen less use than the more widely used meta-chloroperoxybenzoic acid (mCPBA).

Although work up procedures are more simply handled in polar solvents, usage of MMPP to oxidize nonpolar substrates in biphasic media combined with a phase transfer catalyst have been inefficient.

[2] As a surface disinfectant MMPP exhibits a broad spectrum biocidal effect including inactivation of endospores.

[3] Its wide surface compatibility enables its use on sensitive materials, such as plastic and rubber equipment used in hospitals.