METHOD FOR PURIFYING CRUDE PNPNH COMPOUND Russian patent published in 2018 - IPC B01J31/14 B01J31/18 C07F9/00 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to a process useful in the chemical industry for purifying a crude PNPNH compound of general structure R₁R₂P-N(R₃)-P(R₄)-N(R₅)-H, where R₁, R₂, R₃, R₄ and R₅ independently are halogen, amino, trimethylsilyl, C₁-C₁₀-alkyl, C₆-C₂₀-aryl or a cyclic derivative thereof, in which at least one of the P or N atoms of the PNPN-H structure is a member of the ring system, wherein the ring system is formed by substitution from one or more of the component compounds of PNPNH structure, which comprises steps of: (i) suspension purging of a suspension containing a crude PNPNH compound and an alcohol at a temperature of 0-25°C; (ii) stirring the suspension by means of a stirrer or mixer; (iii) separating the PNPNH compound, wherein the alcohol is removed by drying at 10-50°C under a vacuum of 5.0 to 500 millibars, wherein the alcohol/ligand weight ratio is 5.0-0.1.

EFFECT: novel efficient method for purifying a PNPNH compound is proposed.

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