Preparation of new layered double hydroxides exchanged with osmate for asymmetric dihydroxylation of olefins to vicinal diols

摘要

Layered double hydroxides exchanged with osmate of the formula [M^II_(1-x)M^III_x(OH)₂] [OsO₄^2-]_x/2.zH₂O wherein M^II is a divalent cation selected from the group consisting of Mg²⁺, Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺ and Ca²⁺ and M^III is a trivalent ion selected from the group consisting of Al³⁺, Cr³⁺, Mn³⁺, Fe³⁺ and Co³⁺, and x is the mole fraction having a value ranging from 0.2 to 0.33, and z is the number of water molecules ranging from 1 to 4, useful as a catalyst, and a process for the preparation thereof and use thereof to manufacture vicinal diols.