US3888841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for diazotizing aromatic amines
Assignee: Hoechst AG
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Filing: 1972-07-10
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Granted: 1975-06-10
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Expires: 1992-07-10
Abstract
Abstract A process for diazotizing amines in organic solvents is shown. A solution or suspension of a diazotizable amine compound such as p-toluidine or 2-naphthylamine in an excess of a heterocyclic base which may be for example pyridine, quinoline, picoline, lutidine or mixtures thereof and which is inert toward the action of compounds capable of splitting off nitrosyl groups, is diazotized by contacting it with a compound capable of splitting off nitrosyl groups such as nitrosylsulfuric acid or nitrosyl chloride.
Inventors
- 👤 Ernst Spietschka
- 👤 Josef Landler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:00
CPC Classifications
C; C07; C07C; C07C245/00; C07C245/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
A PROCESS FOR DIAZOTINIZING A DIAZOTIZABLE AMINE COMPOUND WHICH CONSISTS OF THE STEPS OF: DISSOLVING OR SUSPENDING A DIAZOTIAZABLE AMINE COMPOUND WHICH DOES NOT CARRY A STRONGLY NEGATIVE SUBSTITUENT IN AN EXCESS OF A HETEROCYCLIC BASE INERT TOWARD THE ACTION OR COMPOUNDS CAPABLE OF SPLITTING OFF NITROSYL GROUPS, SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, QUINOLINE, PICOLINE, LUTIDINE AND MIXTURES THEREOF; AND DIAZOTIZING THE SAID DIAZOTIZABLE AMINE COMPOUND AT A TEMPERATURE OF FROM -15-C TO 10:C AND IN THE ABSENCE OF ACID CONDITIONS WITH A COMPOUND CAPABLE OF SPLITTING OFF NITROSYL GROUPS SELECTED FROM THE GROUP CONSISTING OF NITROSYLSULFURIC ACID AND NITROSYL CHLORIDE,
Claim 2
Dependent Claim
103 words
A PROCESS FOR DIAZOTINIZING A DIAZOTIZABLE AMINE COMPOUND WHICH CONSISTS OF THE STEPS OF: DISSOLVING OR SUSPENDING A DIAZOTIAZABLE AMINE COMPOUND WHICH DOES NOT CARRY A STRONGLY NEGATIVE SUBSTITUENT IN AN EXCESS OF A HETEROCYCLIC BASE INERT TOWARD THE ACTION OR COMPOUNDS CAPABLE OF SPLITTING OFF NITROSYL GROUPS, SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, QUINOLINE, PICOLINE, LUTIDINE AND MIXTURES THEREOF; AND DIAZOTIZING THE SAID DIAZOTIZABLE AMINE COMPOUND AT A TEMPERATURE OF FROM -15-C TO 10:C AND IN THE ABSENCE OF ACID CONDITIONS WITH A COMPOUND CAPABLE OF SPLITTING OFF NITROSYL GROUPS SELECTED FROM THE GROUP CONSISTING OF NITROSYLSULFURIC ACID AND NITROSYL CHLORIDE,
Claim 3
Dependent Claim
26 words
A process as recited in claim 1 wherein said heterocyclic base is used in from 5 to 10 times the amount of said diazotizable amine compound.
References Cited (Backward Citations)
US2778815A
Cited
US3615578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |