Oxidation of thiols to disulfides catalyzed by iron(III) -- tetra phenyl prophyrin Fe (TPP)Cl was investigated using urea-hydrogen peroxide adduct (UHP) as an oxidant in methanol as a solvent.
KARIMI, BAHADOR; MONTAZEROZOHORI, MORTEZA; MOGHADAM, MAJID; HABIBI, MOHAMMAD HOSEIN; and NIKNAM, KHODABAKHSH (2005) "Selective Oxidation of Thiols to Disulfides Catalyzed by Iron(III) -- Tetra Phenyl Porphyrin Using Urea-Hydrogen Peroxide as Oxidizing Reagent," Turkish Journal of Chemistry: Vol. 29: No. 5, Article 11. Available at: https://journals.tubitak.gov.tr/chem/vol29/iss5/11