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US5663382A
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Process for preparing 3-methyltetrahydrofuran
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1996-10-11
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Granted: 1997-09-02
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Expires: 2016-10-11
Abstract
Abstract A process for preparing 3-methyltetrahydrofuran is herein disclosed which comprises reacting a methacrylic acid ester with carbon monoxide and a lower aliphatic alcohol to obtain a methylsuccinic acid diester, and hydrogenating and dehydrating/cyclizing this methylsuccinic acid diester. According to this process, 3-methyltetrahydrofuran can efficiently be obtained from inexpensive starting materials.
Inventors
- 👤 Masaki Takemoto
- 👤 Yoshikazu Shima
- 👤 Takafumi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:56
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
A process for preparing 3-methyltetrahydrofuran which comprises a step 1 of reacting a methacrylic acid ester with carbon monoxide and a lower aliphatic alcohol to synthesize a methylsuccinic acid diester, and a step 2 of hydrogenating and dehydrating/cyclizing the methylsuccinic acid diester which is the product of the step 1.
Claim 2
Dependent Claim
50 words
A process for preparing 3-methyltetrahydrofuran which comprises a step 1 of reacting a methacrylic acid ester with carbon monoxide and a lower aliphatic alcohol to synthesize a methylsuccinic acid diester, and a step 2 of hydrogenating and dehydrating/cyclizing the methylsuccinic acid diester which is the product of the step 1.
Claim 3
Dependent Claim
47 words
The process for preparing 3-methyltetrahydrofuran according to claim 1 wherein the reaction of the methacrylic acid ester with carbon monoxide and the lower aliphatic alcohol is carried out in the presence of an element belonging to any of the group 8 to 10 of the periodic table.
Claim 4
Dependent Claim
29 words
The process for preparing 3-methyltetrahydrofuran according to claim 2 wherein the element belonging to any of the group 8 to 10 of the periodic table is cobalt or ruthenium.
Claim 5
Dependent Claim
51 words
The process for preparing 3-methyltetrahydrofuran according to claim 1 wherein the hydrogenation reaction in the step 2 is carried out in the presence of at least one selected from the group consisting of copper, copper compounds, metals in the groups 7 to 10 of the periodic table, and metallic compounds thereof.
Claim 6
Dependent Claim
29 words
The process for preparing 3-methyltetrahydrofuran according to claim 4 wherein the hydrogenation reaction in the step 2 is carried out in the presence of a hydrogenation catalyst comprising copper-chromite.
References Cited (Backward Citations)
US3859369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-01 | 2001-03-03 | 2001-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-01 | 2005-03-03 | 2005-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-01 | 2009-03-03 | 2009-09-02 | $7700.00 | Window Closed / Lapsed |