| 摘要 |
A process for the preparation of water-soluble vicinal diols by means of a direct catalytic hydroxylation of the corresponding olefines with H2O2. An olefine possibly carrying functional groups inert under the reaction conditions, and whose corresponding vicinal diol is soluble in water, is made to react, under vigorous stirring, with H2O2 at a temperature between 0 DEG and 120 DEG C. and at a pressure between 1 and 100 atmospheres, in a two-phase aqueous liquid/organic liquid system consisting or consisting essentially of an acid aqueous phase containing H2O2 and of an organic phase containing (1) said olefine; (2) possibly a solvent immiscible with the aqueous phase; and (3) a catalyst of the formula: Q3XW4O24-2n wherein Q represents an onium (RR1R2R3M)+ cation, wherein M is chosen from among N, P, As and Sb, and R, R1, R2 and R3, equal to or different from each other, represent hydrogen atoms or hydrocarbon groups having a total of from 20 to 70 carbon atoms; X is an atom of P or As; and n is an integer chosen from among 0, 1 and 2. |
