Patent US4007221A successfully refreshed from Google Patents.
US4007221A
Expired / Lapsed
US
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Manufacture of nuclear-iodinated iodine compounds of aromatic character
Assignee: BASF SE
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Filing: 1976-01-16
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Granted: 1977-02-08
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Expires: 1996-01-16
Abstract
Abstract A process for the manufacture of nuclear-iodinated iodine compounds of aromatic character, by reaction of aromatic diazonium salts with hydriodic acid or its salts in aqueous solution in the presence of a reducing agent.
Inventors
- 👤 Hans Urbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:36
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/68; C07C63/70; C07C201/00; C07C201/06; C07C25/00; C07C25/18; C07C25/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
In a process for the manufacture of an aromatic nuclear-iodinated iodine compound by reacting an aromatic diazonium salt with hydriodic acid or a salt thereof, the improvement which comprises carrying out the reaction in aqueous solution and in the presence of a reducing agent.
Claim 2
Dependent Claim
44 words
In a process for the manufacture of an aromatic nuclear-iodinated iodine compound by reacting an aromatic diazonium salt with hydriodic acid or a salt thereof, the improvement which comprises carrying out the reaction in aqueous solution and in the presence of a reducing agent.
Claim 3
Dependent Claim
50 words
A process as claimed in claim 1 which includes the steps of diazotizing an aromatic compound in an acid medium to provide said diazonium salt in solution and then adding the resulting diazonium solution to an aqueous solution containing the hydriodic acid or a salt thereof and the reducing agent.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 1 wherein the reducing agent is sulfur dioxide or a neutral or acid salt of sulfurous acid.
Claim 5
Dependent Claim
29 words
A process as claimed in claim 1 wherein the reducing agent is added in sufficient amount to decolorize the solution, which is colored due to the formation of iodine.
Claim 6
Dependent Claim
16 words
The process of claim 2 wherein anthranilic acid is diazotized and reacted to produce o-iodobenzoic acid.
Claim 7
Dependent Claim
14 words
The process of claim 2 wherein o-nitroaniline is diazotized and reacted to produce o-nitroiodobenzene.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the hydroiodic acid or its salt is reacted in about the stoichiometric amount required for reaction with the aromatic diazonium salt.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the aromatic diazonium salt is the sulfate.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the aromatic diazonium salt is reacted with potassium iodide in approximately the stoichiometric amount.
Claim 11
Dependent Claim
21 words
The process of claim 9 wherein the reducing agent is sulfur dioxide or a neutral or acid salt of sulfurous acid.
References Cited (Backward Citations)
GB1234558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |