Patent US4002673A successfully refreshed from Google Patents.
US4002673A
Expired / Lapsed
US
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Process for the preparation of unsaturated amino compounds
Assignee: Bayer AG
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Filing: 1974-12-12
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Granted: 1977-01-11
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Expires: 1994-12-12
Abstract
Abstract Process for the preparation of aromatic amines which additionally still contain C-C multiple bonds, characterized in that aromatic nitro compounds which still contain C-C multiple bonds are hydrogenated in the presence of metal sulphides of the formula MeS x in which x is a number from 1 to 4 and Me represents a metal atom of the group consisting of iron, nickel, ruthenium, rhodium, palladium, rhenium, osmium, iridium and platinum as catalysts, at 20° to 140° C and at 5 to 150 bars hydrogen pressure.
Inventors
- 👤 Rudolf Braden
- 👤 Hans Knupfer
- 👤 Sigurd Hartung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:33
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; B; B01; B01J; B01J27/00; B01J27/02; B01J27/04; C07D209/56; C07D209/58; C07D209/72; C07D209/76; C07D249/00; C07D249/16; C07D249/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
Process for the preparation of an aromatic amine which contains an olefinic double bond which comprises hydrogenating an aromatic nitro compound containing an olefinic double bond in the presence of a catalyst consisting essentially of a metal sulphide of the formula MeS x in which x is a number from 1 to 4 and Me is iron, nickel, ruthenium, rhodium, palladium, rhenium, osmium, iridium or platinum at 20° to 140° C and at 5 to 150 bars hydrogen pressure.
Claim 2
Dependent Claim
79 words
Process for the preparation of an aromatic amine which contains an olefinic double bond which comprises hydrogenating an aromatic nitro compound containing an olefinic double bond in the presence of a catalyst consisting essentially of a metal sulphide of the formula MeS x in which x is a number from 1 to 4 and Me is iron, nickel, ruthenium, rhodium, palladium, rhenium, osmium, iridium or platinum at 20° to 140° C and at 5 to 150 bars hydrogen pressure.
Claim 3
Dependent Claim
24 words
Process of claim 1 in which said catalyst is employed in an amount of 0.005 to 10.0% by weight relative to said nitro compound.
Claim 4
Dependent Claim
16 words
Process according to claim 1, characterised in that Me represents iron, nickel, ruthenium, rhenium or platinum.
Claim 5
Dependent Claim
13 words
Process according to claim 1, characterised in that Me represents ruthenium or rhenium.
Claim 6
Dependent Claim
25 words
Process according to claim 1, characterised in that the hydrogenation is carried out at 80° to 125° C and 10 to 80 bars hydrogen pressure.
Claim 7
Dependent Claim
16 words
Process according to claim 1, characterised in that x represents a number from 2 to 3.5.
Claim 8
Dependent Claim
14 words
Process according to claim 1, for the preparation of 4,4'-diaminostilbene-2,2'-disulphonic acid from 4,4'-dinitrostilbene-2,2'-disulphonic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |