US3965200A
Expired / Lapsed
US
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Aromatic compound nitration catalyzed by aromatic sulfonic acid supported on solid carrier
Assignee: Osaka City Government
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Filing: 1972-07-13
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Granted: 1976-06-22
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Expires: 1992-07-13
Abstract
Abstract In nitrating an aromatic compound having at least one of ortho-para orientation substituents, a process which is characterized in that nitration is carried out in the presence of an aromatic sulfonic acid supported on a solid carrier in a weight ratio of 1 : 1 to 1 : 20.
Inventors
- 👤 Osamu Manabe
- 👤 Takashi Kameo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
C; C07; C07B; C07B43/00; C07B43/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A process for the selective para mononitration of an aromatic compound containing an ortho-para directing substituent wherein said aromatic compound is chlorobenzene, bromobenzene, iodobenzene, toluene, xylene, cumene or biphenyl, said aromatic compound being subjected to nitration in the presence of an aromatic sulfonic acid supported on a solid carrier in a weight ratio of 1 : 1 to 1 : 20.
Claim 2
Dependent Claim
61 words
A process for the selective para mononitration of an aromatic compound containing an ortho-para directing substituent wherein said aromatic compound is chlorobenzene, bromobenzene, iodobenzene, toluene, xylene, cumene or biphenyl, said aromatic compound being subjected to nitration in the presence of an aromatic sulfonic acid supported on a solid carrier in a weight ratio of 1 : 1 to 1 : 20.
Claim 3
Dependent Claim
45 words
The process according to claim 1, in which said aromatic sulfonic acid is at least one species selected from the group consisting of toluene-2,4-disulfonic acid, o-benzene disulfonic acid, m-benzene disulfonic acid, chlorobenzene-2,4-disulfonic acid, m-xylene-4,6-disulfonic acid, 5-chlorotoluene-2,4-disulfonic acid, polystyrene sulfonic acid, 1,3,5-tribromobenzene-2,4-disulfonic acid and naphthalene-1,3,6-trisulfonic acid.
Claim 4
Dependent Claim
31 words
The process according to claim 2, in which said aromatic sulfonic acid is at least one species selected from the group consisting of m-benzene disulfonic acid, toluene-2,4-disulfonic acid and chlorobenzene-2,4-disulfonic acid.
Claim 5
Dependent Claim
37 words
The process according to claim 1, in which said solid carrier is one species selected from the group consisting of silica gel, silica sand, asbestos fiber, pumice, glass fiber, glass bead, diatomaceous earth and styrene-divinyl benzene copolymer.
Claim 6
Dependent Claim
14 words
The process according to claim 4, in which said solid carrier is diatomaceous earth.
Claim 7
Dependent Claim
30 words
The process according to claim 1, in which said aromatic sulfonic acid is supported on the solid carrier in a weight ratio of 1 : 1 to 1 : 5.
Claim 8
Dependent Claim
27 words
The process according to claim 1, in which said aromatic compound to be nitrated is one species selected from the group consisting of toluene, chlorobenzene and orthoxylene.
References Cited (Backward Citations)
US2948759A
Cited
US3196186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |