US4087458A
Expired / Lapsed
US
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Process for preparation of 2-(amylbenzoyl)benzoic acid
Assignee: Yamamoto Chemicals Inc
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Filing: 1977-05-06
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Granted: 1978-05-02
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Expires: 1997-05-06
Abstract
Abstract This invention relates to an improvement in the process for preparation of 2-(amylbenzoyl)benzoic acid containing a high percentage of 2-(t-amylbenzoyl)benzoic acid. More particularly it relates to a process for preparation of 2-(amylbenozyl)benzoic acid wherein said 2-(amylbenzoyl)benzoic acid is prepared by reacting t-amylbenzene with phthalic anhydride in the presence of Lewis acid, characterized by that 2-(amylbenzoyl)benzoic acid containing a high percentage of 2-(t-amylbenzoyl)benzoic acid is produced by suppressing the undesirable isomerization reaction of the amyl radical by applying one of the means selected from the group consisting of the means of introducing an inert gas into the reaction system and the means of reducing the pressure of the reaction system. 2-(Amylbenzoyl)benzoic acid is a compound useful as the starting material of preparation of 2-amylanthraquinone which is an effective organic catalyst in the manufacture of hydrogen peroxide.
Inventors
- 👤 Fumitoshi Emori
- 👤 Yasuhisa Iwasaki
- 👤 Takao Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:19
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/373
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A process for preparation of 2-(amylbenzoyl)benzoic acid containing 2-(t-amylbenzoyl)benzoic acid in a higher percentage than that of 2-(s-amylbenzoyl)benzoic acid, wherein said 2-(amylbenzoyl)benzoic acid is prepared by reacting t-amylbenzene with phthalic anhydride in the presence of Lewis acid, which process is characterized by that the isomerization reaction is suppressed by applying one of the means selected from the group consisting of the means of introducing an inert gas into the reaction system and the means of reducing the pressure of the reaction system.
Claim 2
Dependent Claim
82 words
A process for preparation of 2-(amylbenzoyl)benzoic acid containing 2-(t-amylbenzoyl)benzoic acid in a higher percentage than that of 2-(s-amylbenzoyl)benzoic acid, wherein said 2-(amylbenzoyl)benzoic acid is prepared by reacting t-amylbenzene with phthalic anhydride in the presence of Lewis acid, which process is characterized by that the isomerization reaction is suppressed by applying one of the means selected from the group consisting of the means of introducing an inert gas into the reaction system and the means of reducing the pressure of the reaction system.
Claim 3
Dependent Claim
25 words
The process as described in claim 1, wherein the isomerization reaction is suppressed by the means of introducing an inert gas into the reaction system.
Claim 4
Dependent Claim
51 words
The process as described in claim 2, wherein said inert gas or liquid is a gas or a mixture of gases selected from the group consisting of air, nitrogen, oxygen, carbon dioxide, carbon monoxide, freon, nitrogen oxide, sulfur dioxide, sulfur hexafluoride, rare gases, gaseous saturated hydrocarbons, and gasified low boiling liquids.
Claim 5
Dependent Claim
31 words
The process as described in claim 1, wherein said inert gas is a gas or a mixture of gases selected from the group consisting of air, oxygen, nitrogen, and carbon dioxide.
Claim 6
Dependent Claim
24 words
The process as described in claim 1, wherein the isomerization reaction is suppressed by the means of reducing the pressure of the reaction system.
Claim 7
Dependent Claim
22 words
The process as described in claim 5, wherein the pressure of the reaction system is reduced to less than 330 mm Hg.
Claim 8
Dependent Claim
20 words
The process as described in claim 5, wherein the pressure of the reaction system is reduced to 50-250 mm Hg.
Claim 9
Dependent Claim
101 words
A process for preparation of 2-(amylbenzoyl)benzoic acid containing 2-(t-amylbenzoyl)benzoic acid in a higher percentage than that of 2-(s-amylbenzoyl)benzoic acid, wherein said 2-(amylbenzoyl)benzoic acid is prepared by reacting t-amylbenzene with phthalic anhydride in the presence of Lewis acid, which process is characterized by that the t-amylbenzene and phthalic anhydride are reacted in a molar ratio of t-amylbenzene : phthalic anhydride larger than unity, while suppressing the isomerization reaction by applying one of the means selected from the group consisting of the means of introducing an inert gas into the reaction system and the means of reducing the pressure of the reaction system.
Claim 10
Dependent Claim
101 words
A process for preparation of 2-(amylbenzoyl)benzoic acid containing 2-(t-amylbenzoyl)benzoic acid in a higher percentage than that of 2-(s-amylbenzoyl)benzoic acid, wherein said 2-(amylbenzoyl)benzoic acid is prepared by reacting t-amylbenzene with phthalic anhydride in the presence of Lewis acid, which process is characterized by that the t-amylbenzene and phthalic anhydride are reacted in a molar ratio of t-amylbenzene : phthalic anhydride larger than unity, while suppressing the isomerization reaction by applying one of the means selected from the group consisting of the means of introducing an inert gas into the reaction system and the means of reducing the pressure of the reaction system.
References Cited (Backward Citations)
US3764664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |