US5300678A
Expired / Lapsed
US
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Preparation of (107 -substituted urethano alkylcarboxylates)
Assignee: BASF SE
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Filing: 1993-02-05
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Granted: 1994-04-05
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Expires: 2013-02-05
Abstract
Abstract A process for the preparation of a ω-(O-substituted urethano)alkylcarboxylate, wherein a lactam having from 4 to 9 ring members, which can have alkyl, alkenyl, cycloalkyl, or aralkyl groups containing up to 12 carbon atoms as substituents, is reacted with a carbonic diester of an alkanol, alkenol, cycloalkanol, or aralkanol containing up to 16 carbon atoms, at a temperature of from 25° to 300° C. in the presence of a catalytically effective amount of a base.
Inventors
- 👤 Franz Merger
- 👤 Martin Brudermueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:49
CPC Classifications
C; C07; C07C; C07C269/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A one-step process for the preparation of a ω-(O-substituted urethano)alkylcarboxylate, wherein a lactam having from 4 to 9 ring members, which can have alkyl, alkenyl, cycloalkyl, or aralkyl groups containing up to 12 carbon atoms as substituents, is reacted with a carbonic diester of an alkanol, alkenol, cycloalkanol, or aralkanol containing up to 16 carbon atoms, at a temperature of from 25° to 300° C. in the presence of from 0.1 to 30 mole %, based on lactam, of a base.
Claim 2
Dependent Claim
81 words
A one-step process for the preparation of a ω-(O-substituted urethano)alkylcarboxylate, wherein a lactam having from 4 to 9 ring members, which can have alkyl, alkenyl, cycloalkyl, or aralkyl groups containing up to 12 carbon atoms as substituents, is reacted with a carbonic diester of an alkanol, alkenol, cycloalkanol, or aralkanol containing up to 16 carbon atoms, at a temperature of from 25° to 300° C. in the presence of from 0.1 to 30 mole %, based on lactam, of a base.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1, wherein a temperature of from 40° to 100° C. is maintained.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1, wherein the base used is an alkali metal alcoholate of an alkanol having from 1 to 4 carbon atoms, an alkali metal or alkaline-earth metal amide, or an amine.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1, wherein from 1 to 5 mol of carbonic diester are employed for each mole of lactam.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 1, wherein a lactam having from 5 to 9 ring members is used.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1, wherein a carbonic diester of an alkanol or alkenol having from 1 to 4 carbon atoms is used.
References Cited (Backward Citations)
US3078301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |