Preparation of tri-iodo benzene compounds

Details Preparation of tri-iodo benzene compounds Preparation of tri-iodo benzene compounds

2005-10-25

2005-10-25

Shippen, Michael L. (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S163000, C570S206000

Reissue Patent

active

RE038856

ABSTRACT:
The invention provides a process by which ultra low salt content triiodinated aromatic compounds may be isolated from a highly acidic hot triiodinationdelete-start id="DEL-S-00001" date="20051025" ?ractiondelete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20051025" ?reactioninsert-end id="INS-S-00001" ?medium in a straightforward fashion. The process involves increasing the pH todelete-start id="DEL-S-00002" date="20051025" ?above 5delete-end id="DEL-S-00002" ?insert-start id="INS-S-00002" date="20051025" ?a value in the range of 3 to 7insert-end id="INS-S-00002" ?with sodium hydroxide, addition of sodium bisulphite and/or sodium dithionite, addition of seed crystals, cooling slowly, and washing the collected precipitate with water.

REFERENCES:
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patent: WO 89 09766 (1989-10-01), None
patent: WO 91 01296 (1991-02-01), None
patent: WO 96 37461 (1996-11-01), None
Haavaldsen J. et al., ACTA Pharmaceutica Suecica, 20:3, 1983.

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