US3920692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of mesotetraarylporphines
Assignee: BASF SE
•
Filing: 1974-02-19
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Granted: 1975-11-18
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Expires: 1994-02-19
Abstract
Abstract Mesotetraarylporphines are produced by reaction of pyrrole with an aromatic aldehyde in the presence of an organic substance having a dehydrogenating effect as an oxidizing agent and of a lower aliphatic carboxylic acid. The mesotetraarylporphines are suitable as such or in the form of their metal complexes particularly as photooxidation sensitizers.
Inventors
- 👤 Walter Wielant Wiersdorff
- 👤 Martin Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:20
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF A MESOTETRAARYLPORPHINE OF THE FORMULA:
Claim 2
Dependent Claim
12 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF A MESOTETRAARYLPORPHINE OF THE FORMULA:
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 wherein from 0.1 to 1.0 equivalent of the organic dehydrogenating agent is used to 1 mole of pyrrole.
Claim 4
Dependent Claim
44 words
A process as claimed in claim 1 wherein the pyrrole and the aromatic aldehyde are introduced in portions into the reaction zone and after one-tenth to one-half of the weight of the said starting materials has been introduced the organic dehydrogenating agent is added.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 wherein the reaction is carried out in propionic acid or an inert solvent essentially containing propionic acid.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 wherein the reaction is carried out at a temperature of from 70*to 150*C.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 1 wherein naphthoquinone is used as the organic dehydrogenating agent.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1 wherein o-chloranil or p-chloranil is used as the dehydrogenating agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |