METHOD OF PRODUCING PROPYLENE OXIDE Russian patent published in 2014 - IPC C07D301/12 C07D301/03 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing propylene oxide. Described is a method of producing propylene oxide, which includes reacting propylene with hydrogen peroxide in the presence of a catalyst in an aqueous reaction medium which contains water with less than 10 vol% cosolvents, wherein the catalyst contains a water-soluble manganese complex which is a mononuclear complex of formula (I): [LMnX₃]Y (I) or a binuclear complex of formula (II): [LMn(µ-X)₃MnL]Y₂ (II), where Mn denotes manganese; L or each of L independently denotes a polydentate ligand, each of X independently denotes a coordination fragment and each of µ-X independently denotes a bridge coordination fragment, and Y denotes a non-coordination counterion, wherein oxidation is carried out at pH in the range of 1.5 to 6.0 and molar ratio of propylene to hydrogen peroxide ranges from 1:1 to 10:1, where in the water-soluble manganese complex, each of X is independently selected from a group consisting of: RO^-, Cl^-, Br^-, I^-, F^-, NCS^-, $$N_3^{-},$$ $$I_3^{-},$$ NH₃, NR₃, RCOO^-, $$RS{O}_3^{-},$$ $$RS{O}_4^{-},$$ OH^-, O^2-, $$O_2^{2-},$$ HOO^-, H₂O, SH^-, CN^-, OCN^- and $$S_4^{2-}$$ and combinations thereof, where R is selected from a group consisting of C₁-C₂₀alkyl, C₁-C₂₀cycloalkyl, C₁-C₂₀aryl, benzyl and combinations thereof, each of µ-X is independently selected from a group consisting of: RO^-, Cl^-, Br^-, I^-, F^-, NCS^-, $$N_3^{-},$$ $$I_3^{-},$$ NH₃, NR₃, RCOO^-, $$RS{O}_3^{-},$$ $$RS{O}_4^{-},$$ OH^-, O^2-, $$O_2^{2-},$$ HOO^-, H₂O, SH^-, CN^-, OCN^- and $$S_4^{2-}$$ and combinations thereof, where R is selected from a group consisting of C₁-C₂₀alkyl, C₁-C₂₀cycloalkyl, C₁-C₂₀aryl, benzyl and combinations thereof, Y denotes a non-coordination counterion selected from a group consisting of: RO^-, Cl^-, Br^-, I^-, F^-, $$S{O}_4^{2-},$$ RCOO^-, $$P{F}_6^{-},$$ acetate, tosylate, triflate and a combination thereof, where R is selected from a group consisting of C₁-C₂₀-alkyl, C₁-C₂₀-cycloalkyl, C₁-C₂₀-aryl, benzyl and combinations thereof, and each polydentate ligand is independently selected from acyclic compounds having at least 7 atoms in the backbone chain or cyclic compounds having at least 9 atoms in the ring, wherein each polydentate ligand has 3 nitrogen atoms, separated by at least two carbon atoms.

EFFECT: high efficiency and high selectivity of the method of producing propylene oxide.

20 cl, 4 ex