METHOD FOR PRODUCTION OF CYCLOBUTENE Russian patent published in 2022 - IPC C07C23/06 C07C17/25 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for the production of cyclobutene represented by the formula (1): where X¹, X², X³, and X⁴ are the same or different and are a hydrogen atom, a halogen atom, or a perfluoroalkyl group, and Y is a halogen atom. Moreover, the method includes carrying out a reaction of elimination of cyclobutane represented by the formula (2): where X¹, X², X³, X⁴, and Y are as defined above, and X⁵ and X⁶ are the same or different and are a hydrogen atom, a halogen atom, or a perfluoroalkyl group, while the elimination reaction is carried out in the presence of a catalyst in a gas phase. In this case, the catalyst is at least one selected from a group consisting of the following: (i) activated carbon; (ii) at least one metal catalyst selected from a group consisting of chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, fluorinated aluminum oxide, iron oxide, fluorinated iron oxide, nickel oxide, fluorinated nickel oxide, magnesium oxide, fluorinated magnesium oxide; (iii) at least one metal catalyst applied to a carrier. In this case, the carrier is selected from a group including carbon selected from a group consisting of activated carbon, amorphous carbon, graphite, and diamond; aluminum oxide (Al₂O₃), zirconium dioxide (ZrO₂), silicon dioxide (SiO₂), and titanium dioxide (TiO₂). In turn, at least one metal catalyst applied to the carrier is selected from a group consisting of at least one metal catalyst selected from a group consisting of chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, fluorinated aluminum oxide, aluminum fluoride, iron oxide, fluorinated iron oxide, iron fluoride, nickel oxide, fluorinated nickel oxide, nickel fluoride, magnesium oxide, fluorinated magnesium oxide, magnesium fluoride. The contact time (W/F₀) between the initial compound – cyclobutane of the formula (2) and the catalyst ranges from 5 g⋅s/cm³ to 300 g⋅s/cm³.

EFFECT: use of the proposed method allows for obtainment of cyclobutene with high selectivity.

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3 cl, 1 tbl, 10 ex