Ammonium mercaptoalkanesulfonate salts, their preparation, photo

Details Ammonium mercaptoalkanesulfonate salts, their preparation, photo Ammonium mercaptoalkanesulfonate salts, their preparation, photo

1973-09-24

1976-05-25

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260505R, 96 566, 96 61R, 96 61M, C07C14306

Patent

active

039593622

ABSTRACT:
Ammonium mercaptoalkanesulfonate salts having the formula: HS--R--SO.sub.3 .sup.-NH.sub.4 .sup.+ are new salts prepared by a novel process comprising reaction of a thioamide, such as a thioalkanamide or thioarylamide, with a sultone in alcohol. Typical examples comprise reacting thioacetamide with 1,3-propane sultone (for ammonium 3-mercaptopropanesulfonate); with 2,4-butane sultone (for ammonium 3-mercapto-1-methylpropanesulfonate); and with 1,4-butane sultone (for ammonium 4-mercapto-2-butanesulfonate.) The product can be recovered by precipitation with a nonsolvent for the product such as ether, benzene, or ligroine, followed by filtration. The new ammonium salts in aqueous solution are useful as silver complexing agents for photographic fixing or stabilizing, and are more active than the known alkali metal and guanidinium salts, thus providing a new method of fixing developed silver halide photographic elements.

REFERENCES:
patent: 2799702 (1957-07-01), Gaertner
patent: 3438748 (1969-04-01), Tavernier et al.

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