US3855274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing dialkyl (ethylenedioxy) bis-benzoate
Assignee: Asahi Kasei Corp
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Filing: 1971-09-14
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Granted: 1974-12-17
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Expires: 1991-09-14
Abstract
Abstract In the preparation of a dialkyl (ethylenedioxy)bis-benzoate by the reaction of an alkali salt of alkyl hydroxybenzoate with ethylene dichloride in an aliphatic alcohol solvent, the objective compound is obtained in good yield with suppressing the by-production of vinyl chloride by effecting the reaction in a relatively high concentration of the alkali salt of alkyl hydroxybenzoate in the solvent and/or in the presence of the alkyl hydroxybenzoate.
Inventors
- 👤 T Kato
- 👤 C Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:25
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/84; C07C69/88; C07C69/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A PROCESS FOR PREPARING A DIALKYL (ETHYLENEDIOXY)BISBENZOATE COMPRISING REACTING AN ALKALI SALT OF AN ALKYL HYDROXYBENZOATE HAVING ONE TO EIGHT CARBON ATOMS IN THE ALKYL GROUP WITH ETHYLENE DICHLORIDE IN THE PRESENCE OF A SATURATED ALCOHOL AS A SOLVENT, THE IMPROVEMENT WHICH COMPRISES: A. THE ALKALI SALT OF THE C1 TO C8 ALKYL HYDROXYBENZOATE BEING DISSOLVED IN A CONCENTRATION OF 18 TO 80 PERCENT IN A SATURATED ALCOHOL WHICH IS AN ALKANOL HAVING ONE TO SIX ATOMS OR CYCLOHEXANOL OR A MIXTURE THEREOF, AND B. EFFECTING THE REACTION AT A TEMPERATURE BETWEEN 100* AND 280* C. IN THE PRESENCE OF 5 TO 500 MOLE % OF C1 TO C8 ALKYL HYDROXYBENZOATE BASED ON THE AMOUNT OF THE ALKALI SALT OF SAID C1 TO C8 ALKYL HYDROXYBENZOATE.
Claim 2
Dependent Claim
126 words
A PROCESS FOR PREPARING A DIALKYL (ETHYLENEDIOXY)BISBENZOATE COMPRISING REACTING AN ALKALI SALT OF AN ALKYL HYDROXYBENZOATE HAVING ONE TO EIGHT CARBON ATOMS IN THE ALKYL GROUP WITH ETHYLENE DICHLORIDE IN THE PRESENCE OF A SATURATED ALCOHOL AS A SOLVENT, THE IMPROVEMENT WHICH COMPRISES: A. THE ALKALI SALT OF THE C1 TO C8 ALKYL HYDROXYBENZOATE BEING DISSOLVED IN A CONCENTRATION OF 18 TO 80 PERCENT IN A SATURATED ALCOHOL WHICH IS AN ALKANOL HAVING ONE TO SIX ATOMS OR CYCLOHEXANOL OR A MIXTURE THEREOF, AND B. EFFECTING THE REACTION AT A TEMPERATURE BETWEEN 100* AND 280* C. IN THE PRESENCE OF 5 TO 500 MOLE % OF C1 TO C8 ALKYL HYDROXYBENZOATE BASED ON THE AMOUNT OF THE ALKALI SALT OF SAID C1 TO C8 ALKYL HYDROXYBENZOATE.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the alkali salt is a sodium salt of methyl hydroxybenzoate and the alkyl hydroxybenzoate is methyl hydroxybenzoate.
Claim 4
Dependent Claim
20 words
The process according to claim 1, wherein the concentration of the alkali salt of alkyl hydroxybenzoate is 20-80% by weight.
Claim 5
Dependent Claim
18 words
The process according to claim 1, wherein the alkali salt of alkyl hydroxybenzoate is para or meta isomer.
Claim 6
Dependent Claim
22 words
The process according to claim 1, wherein the alkali metal of the alkali salt of alkyl hydroxybenzoate is lithium, sodium or potassium.
Claim 7
Dependent Claim
24 words
The process according to claim 1, wherein the alcohol is methanol, ethanol, propanol, iso-propanol, butAnol, amyalcohol, iso-amylalcohol, hexanol, or cyclohexanol or a mixture thereof.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the reaction is carried out at a temperature between 120* and 230*C.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein the alcohol is ethanol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |