Showing papers by "Helena I. S. Nogueira published in 1997"

Studies on polyoxo and polyperoxo-metalates part 5: Peroxide-catalysed oxidations with heteropolyperoxo-tungstates and -molybdates

Abstract: The new complexes [(LO 4 ){MO(O 2 ) 2 } 2 {MO(O 2 ) 2 (H 2 O)}] 3− (L = P, As; M = W, Mo) are reported and their use as catalysts in the presence of hydrogen peroxide for epoxidation of alkenes and oxidations of alcohols, tertiary amines and sulfides discussed. Similar oxidations are reported for salts of [(LO 3 (OH)){MO(O 2 ) 2 } 2 ] 2− (L = P, As; M = W, Mo), [(PhPO 3 ){MO(O 2 ) 2 } 2 {MO(O 2 ) 2 (H 2 O)}] 3− (M = W, Mo) and [(R 2 LO 2 ){MO(O 2 ) 2 } 2 ] − (R = Ph, Me; L = P, As; M = W, Mo). Alkene epoxidations and alcohol oxidations are also reported for [PW 11 O 39 ] 7− , [Ln III {PW 11 O 39 } 2 ] 11− (Ln = Y, La, Ce, Pr, Sm, Tb, Yb) and [M IV {PW 11 O 39 } 2 ] 10− (M = Ce, Th).