Patent ID: 9221856
Filing Date: 2015-12-29
Classification: B01J,C07F

Abstract:
1. A method for purifying a crude PNPNH compound of the general structure wherein R 1 , R 2 , R 3 , R 4 and R 5 are independently halogen, amino, trimethylsilyl, C 1 -C 10 -alkyl, substituted C 1 -C 10 -alkyl, C 6 -C 20 -aryl and substituted C 6 -C 20 -aryl, or any cyclic derivative wherein at least one of the P or N atoms of the PNPN—H structure is a member of a ring system, the ring system being formed from one or more constituent compounds of the PNPNH-structure by substitution, comprising: a) dissolving the PNPNH-compound in a first solvent; b) metalating the PNPNH-compound, c) isolating the metalated compound obtained in step b), d) re-protonating the metalated compound in a second solvent, and e) optionally removing the second solvent and optionally recrystallizing the re-protonated PNPNH ligand.