Sugar amides and mixtures thereof
US-2024409523-A1 · Dec 12, 2024 · US
Process for the manufacture of 3-oxo-tetrahydrofuran
US9399629B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9399629-B2 |
| Application number | US-201414203666-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 11, 2014 |
| Priority date | Mar 12, 2013 |
| Publication date | Jul 26, 2016 |
| Grant date | Jul 26, 2016 |
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- Title
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Abstract
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This invention relates to a novel method for the preparation of 3-oxo-tetrahydrofuran comprising oxidizing 3-hydroxy-tetrahydrofuran in the presence of a catalytic amount of 2,2,6,6-tetramethyl-piperidine-N-oxyl (TEMPO) with trichloroisocyanuric acid.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for preparing 3-oxo-tetrahydrofuran comprising reacting 3-hydroxy tetrahydrofuran (II) with 0.5-2 mol equivalents of trichloroisocyanuric acid in the presence of 0.001-1 mol equivalent 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) in a solvent selected from the group consisting of dichloromethane, ethyl acetate, isopropyl acetate and toluene; and at a temperature of −20° C. to 40° C., wherein the process is conducted in the absence of HCO 3 − , a bromide or other additives. 2. The process according to claim 1 wherein the reaction is conducted at a temperature of −10° C. to 25° C. 3. The process according to claim 1 wherein the amount of trichloroisocyanuric acid is 1.0 to 2.0 mol equivalent. 4. The process according to claim 1 wherein the amount of TEMPO is 0.01 to 0.02 mol equivalent. 5. The process according to claim 1 wherein in the oxidation step a solution of TEMPO in dichloromethane or ethylacetate is added to the solution of 3-hydroxy tetrahydrofuran and trichloroisocyanuric acid. 6. The process according to claim 1 wherein the trichloroisocyanuric acid is added in portions to the solution of 3-hydroxy tetrahydrofuran and TEMPO in dichloromethane or ethylacetate.
Assignees
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Classifications
- C07D307/20Primary
Oxygen atoms · CPC title
- C07D307/32Primary
Oxygen atoms · CPC title
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Frequently asked questions
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- What does patent US9399629B2 cover?
- This invention relates to a novel method for the preparation of 3-oxo-tetrahydrofuran comprising oxidizing 3-hydroxy-tetrahydrofuran in the presence of a catalytic amount of 2,2,6,6-tetramethyl-piperidine-N-oxyl (TEMPO) with trichloroisocyanuric acid.
- Who is the assignee on this patent?
- Xing Lidong, Dong Weitong, Lu Jun, and 4 more
- What technology area does this patent fall under?
- Primary CPC classification C07D307/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 26 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).