Patent ID: 8455423
Filing Date: 2013-06-04
Classification: B01J,C11D,D06L,D21C

Abstract:
1. An aqueous solution of a preformed transition metal catalyst salt, which salt is a mononuclear or dinuclear complex of a Mn(III) or Mn(IV) transition metal catalyst having a non-coordinating counter ion selected to provide a preformed transition metal catalyst salt that has a water solubility of at least 30 g/l at 20 ° C. and wherein the ligand of the transition metal catalyst is of formula (I): wherein: p is 3; R is independently selected from: hydrogen, C1-C6-alkyl, CH2CH2OH, and CH2COOH, or one of R is linked to the N of another Q via an ethylene bridge; and R1, R2, R3, and R4 are independently selected from: H, C1-C4-alkyl, and C1-C4-alkylhydroxy, which aqueous solution is present in a buffer system that maintains the solution in a pH range of 2 to 5.