Patent EP0311773A2 successfully refreshed from Google Patents.
US4095034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of α-naphthyl-N-methyl-carbamate
Assignee: BASF SE
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Filing: 1976-04-09
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Granted: 1978-06-13
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Expires: 1996-04-09
Abstract
Abstract Process for the manufacture of N-alkyl and N-alkenyl carbamates by reacting a hydroxyl compound with a carbamyl chloride essentially free from phosgene and hydrogen chloride at a temperature of from 60° to 130° C in alkyl or halogen benzenes as solvent.
Inventors
- 👤 Dietrich Mangold
- 👤 Karl-Heinz Koenig
- 👤 Christian Reitel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:16
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A process for the manufacture of α-naphthyl-N-methylcarbamate by the reaction of methylcarbamyl chloride and α-naphthol containing β-naphthol as an impurity, which comprises reacting methylcarbamyl chloride, which is essentially free from phosgene and hydrogen chloride, in the absence of an acid-binding agent, with α-naphthol containing β-naphthol as an impurity at a temperature in the range of 60° to 130° C in, as solvent, cumene, the starting concentration of said naphthol in the cumene being in the range of 20 to 40% by weight, based on the cumene, and cooling the reaction mixture to precipitate the α-naphthyl-N-methylcarbamate as a pure crystalline solid, the β-naphthyl-N-methylcarbamate formed in the reaction remaining in solution in the cumene when the reaction mixture is cooled.
Claim 2
Dependent Claim
118 words
A process for the manufacture of α-naphthyl-N-methylcarbamate by the reaction of methylcarbamyl chloride and α-naphthol containing β-naphthol as an impurity, which comprises reacting methylcarbamyl chloride, which is essentially free from phosgene and hydrogen chloride, in the absence of an acid-binding agent, with α-naphthol containing β-naphthol as an impurity at a temperature in the range of 60° to 130° C in, as solvent, cumene, the starting concentration of said naphthol in the cumene being in the range of 20 to 40% by weight, based on the cumene, and cooling the reaction mixture to precipitate the α-naphthyl-N-methylcarbamate as a pure crystalline solid, the β-naphthyl-N-methylcarbamate formed in the reaction remaining in solution in the cumene when the reaction mixture is cooled.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein the hydrogen chloride formed during the reaction is entrained from the reaction solution by an inert gas.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the reaction is carried out at a temperature ranging from 70° to 90° C.
References Cited (Backward Citations)
DE1910295A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |