US3152148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of comenic and pyromeconic acids
Assignee: Dow Chemical Co
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Filing: 1963-01-03
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Granted: 1964-10-06
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Expires: 1983-01-03
Abstract
No abstract record available.
Inventors
- 👤 James P Easterly
- 👤 Henry E Hennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:54
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/34; C07D309/36; C07D309/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A PROCESS FOR MAKING PYROMECONIC ACID WHICH COMPRISES, IN COMBINATION, THE STEPS OF: (A) REACTING BY CONTACTING THE 5-(LOWER ALKYL) ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PH OF ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100* C. IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF FINELY DIVIDED CATALYTIC PALLADIUM, THEREBY FORMING THE LOWER ALKYL ETHER OF COMENIC ACID, (B) HEATING SAID LOWER ALKYL ETHER OF COMENIC ACID AT 200*-250*., THEREBY FORMING THE LOWER ALKYL ETHER OF PYROMECONIC ACID, AND
Claim 2
Dependent Claim
83 words
A PROCESS FOR MAKING PYROMECONIC ACID WHICH COMPRISES, IN COMBINATION, THE STEPS OF: (A) REACTING BY CONTACTING THE 5-(LOWER ALKYL) ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PH OF ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100* C. IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF FINELY DIVIDED CATALYTIC PALLADIUM, THEREBY FORMING THE LOWER ALKYL ETHER OF COMENIC ACID, (B) HEATING SAID LOWER ALKYL ETHER OF COMENIC ACID AT 200*-250*., THEREBY FORMING THE LOWER ALKYL ETHER OF PYROMECONIC ACID, AND
Claim 3
Dependent Claim
108 words
A PROCESS FOR MAKING COMENIC ACID WHICH COMPRISES, IN COMABINATION, THE STEPS OF: (A) REACTING BY CONTACTING A 5-(LOWER ALKYL) ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PHE OF ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100*C. IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF FINELY DIVIDED PALLADIUM, THEREBY FORMING THE LOWER ALKYL ETHER OF COMENIC ACID, AND (B) REACTING BY CONTACTING SAID LOWER ALKYL ETHER OF COMENIC ACID WITH AT LEAST ABOUT 1.4 MOLAR PROPORTIONS OF ZINC HALIDE AT ABOUT 160*-210*C. FOR A TIME SUFFICIENT FOR A SIGNIFICANT AMOUNT OF REACTION TO TAKE PLACE, AND SEPARATING COMENIC ACID FROM THE REACTION MIXTURE THEREBY OBTAINED.
Claim 4
Dependent Claim
108 words
A PROCESS FOR MAKING COMENIC ACID WHICH COMPRISES, IN COMABINATION, THE STEPS OF: (A) REACTING BY CONTACTING A 5-(LOWER ALKYL) ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PHE OF ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100*C. IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF FINELY DIVIDED PALLADIUM, THEREBY FORMING THE LOWER ALKYL ETHER OF COMENIC ACID, AND (B) REACTING BY CONTACTING SAID LOWER ALKYL ETHER OF COMENIC ACID WITH AT LEAST ABOUT 1.4 MOLAR PROPORTIONS OF ZINC HALIDE AT ABOUT 160*-210*C. FOR A TIME SUFFICIENT FOR A SIGNIFICANT AMOUNT OF REACTION TO TAKE PLACE, AND SEPARATING COMENIC ACID FROM THE REACTION MIXTURE THEREBY OBTAINED.
Claim 5
Dependent Claim
64 words
IN A PROCESS FOR THE OXIDATION OF A 5-(LOWER ALKYL) ETHER OF KOJIC ACID TO THE CORRESPONDING LOWER ALKYL ETHER OF COMENIC ACID WHICH COMPRISES CONTACTING SAID ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PH F ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100*C. IN THE PRESENCE OF A METALLIC CATALYST, THE IMPROVEMENT WHEREIN THE METALLIC CATALYST IS FINELY DIVIDED PALLADIUM.
Claim 6
Dependent Claim
64 words
IN A PROCESS FOR THE OXIDATION OF A 5-(LOWER ALKYL) ETHER OF KOJIC ACID TO THE CORRESPONDING LOWER ALKYL ETHER OF COMENIC ACID WHICH COMPRISES CONTACTING SAID ETHER OF KOJIC ACID IN WATER SUSPENSION AT A PH F ABOUT 4-8 WITH AN OXYGEN-CONTAINING GAS AT ABOUT 50*-100*C. IN THE PRESENCE OF A METALLIC CATALYST, THE IMPROVEMENT WHEREIN THE METALLIC CATALYST IS FINELY DIVIDED PALLADIUM.
Claim 7
Dependent Claim
48 words
A PROCESS FOR THE PREPARATION OF HYDROXY-4-PYRANONE WHICH COMPRISES REACTING BY CONTACTING A MOLE OF A LOWER ALKOXY-4-PYRANONE WITH AT LEAST ABOUT 1.4 MOLES OF ZINC HALIDE AT ABOUT 160*C. TO ABOUT 210*C. FOR A LENGTH OF TIME SUFFICIENT FOR A SIGNIFICANT AMOUNT OF REACTION TO TAKE PLACE.
Claim 8
Dependent Claim
48 words
A PROCESS FOR THE PREPARATION OF HYDROXY-4-PYRANONE WHICH COMPRISES REACTING BY CONTACTING A MOLE OF A LOWER ALKOXY-4-PYRANONE WITH AT LEAST ABOUT 1.4 MOLES OF ZINC HALIDE AT ABOUT 160*C. TO ABOUT 210*C. FOR A LENGTH OF TIME SUFFICIENT FOR A SIGNIFICANT AMOUNT OF REACTION TO TAKE PLACE.
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) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |