Process for the preparation of supported osmates
AssigneeCouncil of Scientific and Industrial Research
InventorsBoyapati M. Choudary, Naidu S. Chowdari, Mannepalli L. Kantam, Kondapuram V. Raghavan
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Abstract
The present invention discloses a process for the preparation of a novel heterogeneous osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules by reacting potassium osmate with supported quaternary ammonium species in an aqueous solvent.
Claims15
A process for the preparation of a novel heterogeneous osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules, said process comprising reacting potassium osmate with supported quaternary ammonium species in an aqueous solvent at a temperature in the range of 20 to 30° C. for a period in the range of 5-24 hours under nitrogen atmosphere followed by washing to obtain the desired catalyst.
A process for the preparation of vicinal diols comprising asymmetrically dihydroxylating the corresponding olefin in the presence of a cinchona alkaloid using an oxidant such as herein described in a solvent system consisting of water and at least one of acetone, acetonitrile and t-butanol, in a ratio of water:acetone, water:acetonitrile and water:t-butanol of 1:1 to 1:3, and water:acetone:acetonitrile in a ratio of 1:1:1;
- at a temperature in the range of −70 to 100° C. for a period in the range of 0.5 to 24 hours, and in the presence of a catalytic amount of a heterogeneous supported osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules, and recovering the pure vicinal diol by any conventional method.
Dependencies are inferred from the claim text.