“…The Keggin anions and their derivatives have been used as catalysts for various types of oxidative reactions, like the epoxidation of alkenes and the hydroxylation of alkanes [3][4][5]. In particular, transition metal mono-substituted Keggin-type heteropolytungstates, [XW 11 M(H 2 O)O 39 ] (n-m)-(X = P, Si, B), in which a transition metal cation, M n+ , is co-ordinated to the binding sites of lacunary heteropolyanion α-[XW 11 O 39 ] n-, have generated great interest as oxidative catalysts [6][7][8][9][10][11][12][13]. Even so, oxidative catalysis in the presence of Keggin-type mono-substituted borotungstates has not been widely studied and only a few reports were found.…”