70% tert-Butyl hydroperoxide (TBHP) has been found to be an efficient and selective reagent for the mild oxidative cleavage of the C=N of oximes and tosylhydrazones to yield their corresponding carbonyl compounds.
Barhate, N. B., Gajare, A. S., Wakharkar, R. D., & Sudalai, A. (1997). Facile regeneration of carbonyl compounds from oximes and tosylhydrazones with TBHP. Tetrahedron Letters, 38(4), 653–656. https://doi.org/10.1016/S0040-4039(96)02384-2