Sodium perborate (SPB)

(A) Sodium perborate has been employed as an efficient catalyst for the preparation of (diacetoxyiodo)arenes from iodoarenes. (B) Bjorsvik et al. reported a new catalytic oxidation method for the preparation of aromatic carboxylic acids from methyl aryl ketones. The catalytic cycle is based on the use of an electron-deficient nitroarene as a catalyst with either one of the two cheap and green oxidants sodium perborate or sodium percarbonate. (C) Several primary aromatic amines, substituted with electron-donating groups, were converted into their corresponding nitro compounds in good to excellent yield with sodium perborate tetrahydrate (SPB) in micellar media in the presence of a catalytic amount of tungstophosphoric acid (H3PW·nH 2O). (D) Roche et al. reported the selective monobromination of various deactivated anilines using potassium bromide and sodium perborate. The use of ammonium molybdate as catalyst accelerates the rate of reaction but is not essential to obtain good yields and high selectivities. (E) Decarbonylation of β-aryl and β-heterocycle pyruvic acids catalyzed by sodium perborate tetrahydrate in aqueous solution at ambient temperature give the corresponding arylacetic acids in good yield. (F) Bandgar et al. show unique selectivity and constitute a useful alternative to commonly accepted deacylation procedures. Moreover, the superiority and flexibility of the protocol lies in its ease of operation and simplicity in work-up which involves mere filtration of the reagent. Clean deprotection under mild and neutral conditions using this cheap and easily available reagent make this simple protocol economically attractive. (G) Rearrangement of aldimine to formamide is another application of sodium perborate. C,N-Diarylaldimines and C-alkyl-N-arylaldimines undergo this rearrangement. © Georg Thieme Verlag Stuttgart.