Patent US3904602A successfully refreshed from Google Patents.
US3904602A
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Process for the manufacture of tetrasubstituted ureas
Assignee: Novartis Corp
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Filing: 1972-02-11
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Granted: 1975-09-09
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Expires: 1992-02-11
Abstract
Abstract A process for the manufacture of N,N,N'',N''-tetrasubstituted ureas of the general formula in which R1 to R4 each represent an alkyl radical, with R1 and R2 and R3 and R4 in each case together with the nitrogen atom to which they are bonded, being able to form a heterocyclic ring which may optionally contain further hetero atoms, wherein N,Ndisubstituted carbamic acid halides of the formula in which R1 and R2 have the meaning given above and X represents a halogen atom, especially chlorine or bromine are reacted with a secondary amine and an inorganic base, preferably anhydrous ammonia and the new N,N,N'',N''-tetrasubstituted ureas.
Inventors
- 👤 Tibor Somlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:13
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1836; C07C273/1845
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
12 words
A PROCESS FOR THE MANUFACTURE OF A N,N,N2,N''-TETRASUBSTITUTED UREA OF THE FORMULA
Claim 2
Dependent Claim
12 words
A PROCESS FOR THE MANUFACTURE OF A N,N,N2,N''-TETRASUBSTITUTED UREA OF THE FORMULA
Claim 3
Dependent Claim
11 words
A process for the manufacture of N,N,N'',N''-tetrasubstituted urea of the formula
Claim 4
Dependent Claim
11 words
A process for the manufacture of N,N,N'',N''-tetrasubstituted urea of the formula
Claim 5
Dependent Claim
23 words
The process of claim 2, wherein the treatment is carried out under pressure at a temperature in the range of -20* to +120*C.
Claim 6
Dependent Claim
18 words
The process of claim 2, wherein X is chlorine, the treatment is carried out at 40*C to 70*C.
Claim 7
Dependent Claim
13 words
The process of claim 2, wherein R1, R2, R3 and R4 are identical.
Claim 8
Dependent Claim
13 words
The process of claim 4, wherein R1, R2, R3 and R4 are identical.
Claim 9
Dependent Claim
13 words
The process of claim 5, wherein R1, R2, R3 and R4 are methyl.
Claim 10
Dependent Claim
23 words
The process of claim 2, wherein the treatment is carried out in the absence of solvent or in the N,N,N'',N'',-tetrasubstituted urea being manufactured.
Claim 11
Dependent Claim
23 words
The process of claim 4, wherein the treatment is carried out in the absence of solvent or in the N,N,N'',N''-tetrasubstituted urea being manufactured.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |