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US3687938A
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Process for the preparation of lactam-lewis acid complex
Assignee: Ube Corp
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Filing: 1970-08-31
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Granted: 1972-08-29
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Expires: 1990-08-31
Abstract
Abstract A process for the preparation of lactams, which comprises reacting lactim-O-sulfonic acid with a complex of alicyclic ketoxime with a halide which is a Lewis acid, and recovering the complex of lactam with the halide.
Inventors
- 👤 Mitsuo Masaki
- 👤 Kiyoshi Fukui
- 👤 Mashiro Ueda
- 👤 Klyomi Okimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:17
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D211/76
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The process of claim 1 wherein said halide is present in the reaction system in a quantity not exceeding an amount equimolar to said lactim-O-sulfonic acid initially present in the reaction system.
Claim 2
Dependent Claim
58 words
The process of claim 2 wherein said complex of said alicyclic ketoxime with said halide is represented by the formula, wherein m is a number of 3 to 11, M'' is tin, zirconium, boron, zinc, antimony or aluminum, X is a halogen atom, p is a number equalling the valency of M'', and a is 1/2 or 1.
Claim 3
Dependent Claim
157 words
A process for the preparation of lactams, which comprises adding to a reaction system comprising an inert organic solvent and lactim-O-sulfonic acid (a) of the formula, wherein n is a number of 3 to 11, and R1 and R2 are each a hydrogen atom, an alkyl group or alkenyl group, dissolved therein a complex compound (b) of a ketoxime of the formula, wherein n, R1 and R2 are as defined above, with a halide of the formula, MXp wherein M is an element of Groups I-B, II-B, III-A, IV-A, IV-B, V-A or VIII of the Periodic Table, X is a halogen atom, and p is a number equalling the valency of M, at such a ratio that said complex (b) does not exceed 500 mol percent based on said lactim-O-sulfonic acid (a) in the reaction system, at a temperature ranging from 20* to 100* C., and recovering the formed complex of the corresponding lactam with said halide.
References Cited (Backward Citations)
US3114748A
Cited
US3090739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |