METHOD FOR PRODUCING A PERFLUOROALKADIENE COMPOUND Russian patent published in 2022 - IPC C07C17/23 C07C21/19 B01J31/26 

FIELD: chemistry.

SUBSTANCE: invention relates to a perfluoroalkadiene composition suitable for producing etching gases, coolants, heat-conducting media, foaming agents, and resin monomers. Composition contains a perfluoroalkadiene compound represented by formula (1), wherein n constitutes an integer from 4 to 20; a compound represented by formula (3), wherein n has values as defined above and X³ stands for a halogen atom; a compound represented by formula (4A), wherein n has values as defined above, X¹ and X² are the same or different and stand for a halogen atom, provided that X¹ and X² are not simultaneously a fluorine atom; and/or a compound represented by formula (4B), wherein n has values as defined above, X² and X³ are the same or different and stand for a halogen atom; and a compound represented by formula (5), wherein n has values as defined above, X¹, X², and X³ are the same or different and stand for a halogen atom, provided that X¹ and X² are not simultaneously a fluorine atom, wherein the compound represented by formula (1) is contained in an amount from 80 to 99.8% mol., and the compound represented by formula (5) is contained in an amount from 0.05 to 1% mol., as calculated for the total amount of perfluoroalkadiene composition taken as 100% mol. Invention also relates to an etching gas, a coolant, a heat transfer medium, a foaming agent, and a resin monomer.

EFFECT: proposed method provides the possibility of synthesising the target compound with a higher yield with lesser production of hard-to-isolate inclusions.

CF₂=CF-(CF₂)_n-4-CF=CF₂ (1)

CF₂=CF-(CF₂)_n-4-CFX³-CF₂H (3)

CF₂X¹-CFX²-(CF₂)_n-4-CF=CF₂ (4A)

CF₂H-CFX²-(CF₂)_n-4-CFX³-CF₂H (4B)

CF₂X¹-CFX²-(CF₂)_n-4-CFX³-CF₂H (5)

7 cl, 3 tbl, 8 ex