Process for synthesizing diorganomonothiophosphinates

Details Process for synthesizing diorganomonothiophosphinates Process for synthesizing diorganomonothiophosphinates

1984-11-28

1985-11-26

Evans, J. E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260465R, 2604651, 2605025B, C07F 930

Patent

active

045553688

ABSTRACT:
A new and improved method for making diorganomonothiophosphinate compounds having the formula: ##STR1## which comprises oxidizing a secondary phosphine in aqueous media to form the corresponding secondary phosphine oxide and reacting the secondary phosphine oxide thus formed with an excess of sulfur and an hydroxide compound at elevated temperature for a time sufficient until formation of the diorganomonothiophosphinate compound is substantially complete. The new and improved process of the present invention permits the preparation of diorganomonothiophosphinate. The products are stable in aqueous systems and are useful as sulfide collectors in froth flotation beneficiation of sulfide minerals.

REFERENCES:
patent: 3232830 (1966-02-01), Schrader et al.
patent: 3238248 (1966-03-01), Rauhut
patent: 3261857 (1966-07-01), Rauhut
patent: 3812223 (1974-05-01), Tsuchiya
patent: 3833662 (1974-09-01), Staendeke et al.
patent: 4308214 (1981-12-01), Robertson et al.
Rauhut et al., "J. Am. Chem. Soc.", vol. 80 (1958), pp. 6690, 6691.

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