Method for preparing disodium 2,2'-dithiobis(ethanesulphonate)

Details Method for preparing disodium 2,2'-dithiobis(ethanesulphonate) Method for preparing disodium 2,2'-dithiobis(ethanesulphonate)

2005-08-30

2005-08-30

Davis, Brian J. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

Reexamination Certificate

active

06936733

ABSTRACT:
The invention concerns a novel method for industrial preparation of disodium 2,2′-dithiobis(alkylsulphonates), and in particular disodium 2,2′-dithiobis(ethanesulphate) (dimesna). Said novel method is summarized by the reaction diagram (A). In diagram (A), Hal represents a halogen atom, and preferably a bromine atom; M represents a sodium or potassium atom; and n represents an integer ranging between 0 and 2.

REFERENCES:
patent: 5808140 (1998-09-01), Haridas
patent: 5922902 (1999-07-01), Haridas
patent: 6504049 (2003-01-01), Kochat
patent: 98/14426 (1998-04-01), None
Database CAPLUS on STN, Doc. No. 110:7669, (XP-002160848) CS 252564 (Sep. 17, 1987) (abstract).
Database CAPLUS on STN, Doc. No. 87:52754, BE 842665 (Dec. 8, 1976) (abstract).

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