Cyclic use of thallic oxide for preparing propylene oxide

Details Cyclic use of thallic oxide for preparing propylene oxide Cyclic use of thallic oxide for preparing propylene oxide

1977-07-22

1979-03-27

Milestone, Norma S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30120

Patent

active

041465458

ABSTRACT:
In an aqueous alkaline solution having a pH greater than 11.9, thallous isobutyrate is oxidized by air at a temperature within a range from about 90.degree. to about 250.degree. C. to prepare a slurry of thallic oxide from which thallic oxide can be recovered. The alkaline isobutyrate solution can be treated with carbon dioxide under pressure to form a carbonate salt and isobutyric acid, which can be solvent extracted from the aqueous system using any hydrophobic solvent as extractant. Such isobutyric acid can be employed in a 30 percent aqueous solution at 90.degree.-150.degree. C. to dissolve thallic oxide and to prepare thallic triisobutyrate. This aqueous solution of thallic triisobutyrate can be employed for the oxidation of an organic compound susceptible to oxidation to desirable partially oxidized organic compounds. Gaseous propylene can be bubbled through a liquid reaction mixture containing water, an organic solvent miscible with water, and thallic trialkanoate to prepare gaseous propylene oxide. The carbonate salt can be thermally decomposed to regenerate an alkaline metal hydroxide and carbon dioxide. The availability of this novel preparation of thallic oxide makes feasible the recycling of most components, so that the thallium ion is an intermediate useful for the oxidation of an organic compound indirectly using the oxygen of air through such cyclic processing of the thallium ion.

REFERENCES:
patent: 3436409 (1969-04-01), Hill et al.
patent: 3641067 (1972-02-01), Kruse
Kruse et al., J. Org. Chem., vol. 36, No. 8 (1971) pp. 1154-1155.
P. Schindler, Chimia (Switzerland) vol. 11 (1957) pp. 164-166.

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