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

FIELD: chemical or physical processes.

SUBSTANCE: present invention can be used in the chemical industry and relates to a method for purifying a crude PNPNH compound. Proposed method for purifying a crude PNPNH compound of general structure R₁R₂P-N(R₃)-P(R₄)-N(R₅)-H, where R₁, R₂, R₃, R₄ and R₅ are independently trimethylsilyl, C₁-C₁₀-alkyl, C₆-C₂₀-aryl or cyclic derivative of a PNPNH compound 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 the PNPNH structure, where substitution is a formal cleavage on each compound-compound or two whole groups R₁-R₅ or H, one atom from each of the two groups R₁-R₅, or the whole group R₁-R₅, or H and an atom from another group R₁-R₅ and the bonding of thus formally created unsaturated sites of valency by means of a single covalent bond in each component compound to provide the same valence as originally present at a predetermined site, includes: (a) dissolving the PNPNH compound in a first solvent; (b) metalating the PNPNH compound; (c) isolating the metalated compound obtained at step b); and (d) re-protonating the metalated compound in a second solvent.

EFFECT: disclosed is a novel efficient method of purifying valuable compounds useful in the process of oligomerisation of ethylene.

16 cl, 4 ex, 1 tbl