| 摘要 |
PURPOSE:The hydration of a monoepoxide of 1,3-conjugated diene is conducted in the presence of water using a copper compound as a catalyst to form 2-butene-1,4- diol useful as an intermediate for chemicals in high selectivity. CONSTITUTION:The hydration of a monoepoxide of 1,3-conjugated diene of formula I (R1-4 is H, hydrocarbyl wherein R1 and R4 may incorporate to form ring) is conducted in the presence of water a copper compound as a catalyst to produce 2-butene-1,4-diol derivative of formula II. As the copper compound, the bromide is suitable, especially cuprous bromide is preferred. The amount of the catalyst is 0.1-100wt% on the epoxide basis. The epoxide is, e.g., 3,4-epoxybutene-1. The reaction may be effected in an aqueous medium; however, the use of organic solvents is preferred. The reaction temperature is -10 -200 deg.C. |
