METHOD OF OBTAINING TRANS-CYCLOPENTANEDIOL-1,2 Russian patent published in 2009 - IPC C07C29/03 C07C35/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining trans-cyclopentanediol-1,2, which is used in synthesis of fragrant, pharmaceutical, bactericidal and agricultural preparations. The method involves reacting cyclopentene with an aqueous solution of hydrogen peroxide, in molar ratio cyclopentene: hydrogen peroxide 1:(1.3-2), at temperature 50-70°C, in the presence of an interphase catalyst, at pH of the aqueous phase equal to 1-1.5, in a halogenalkyl, dichloroethylene solvent medium, with subsequent extraction of the desired product. The intephase catalyst used is quaternary ammonium salts of general formula (C_nH_2n+1R₁R₂R₃)⁺NX, where n varies from 1 to 20, X=Cl^-, Br^-, I^-, R₁, R₂, R₃=C_pH_2p+1, where p varies from 1 to 20, molar ratio cyclopentene : tungsten salt : phosphoric acid : interphase catalyst is 1 : (2·10^-3-4·10^-3): (4·10^-3-8·10^-3): (2·10^-3-7·10^-3), and the reaction is carried out in the presence of water.

EFFECT: method increases efficiency of the process due to virtually complete conversion cyclopentene and multiple use of the catalyst complex without reactivation.

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