US2915532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 3, 5-dihydroxy-3 methylpentanoic acid and the delta-lactone thereof
Assignee: Merck and Co Inc
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Filing: 1957-02-15
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Granted: 1959-12-01
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Expires: 1977-02-15
Abstract
No abstract record available.
Inventors
- 👤 Walton Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:06
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/38; C07; C07C; C07C51/00; C07C51/09; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/853; Y10S435/854
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A METHOD FOR THE PREPARATION OF 3,5-DIHYDROXY-3METHYLPENTANOIC ACID AND B-HYDROXY-B-METHYL-8-VALEROLACTONE WHICH COMPRISES REACTING 4-BENZYLOXY-2-BUTANONE WITH A LOWER ALKYL ESTER OF BROMOACETIC ACID IN A LIQUID ORGANIC REACTION SOLVENT IN THE PRESENCE OF METALLIC ZINC TO PRODUCE A LOWER ESTER OF 5-BENZYLOXY-3-HYDROXY-3METHYLPENTANOIC ACID AND CONVERTING SAID ESTER TO 3,5DIHYDROXY-3-METHYLPENTANOIC ACID AND B-HYDROXY-BMETHYL-8-VALEROLACTONE (A) BY HYDROLYSIS OF THE ESTER GROUP AND (B) BY REMOVAL OF THE BENZYL GROUP BY HYDROGENATION.
Claim 2
Independent Claim
68 words
A METHOD FOR THE PREPARATION OF 3,5-DIHYDROXY-3METHYLPENTANOIC ACID AND B-HYDROXY-B-METHYL-8-VALEROLACTONE WHICH COMPRISES REACTING 4-BENZYLOXY-2-BUTANONE WITH A LOWER ALKYL ESTER OF BROMOACETIC ACID IN A LIQUID ORGANIC REACTION SOLVENT IN THE PRESENCE OF METALLIC ZINC TO PRODUCE A LOWER ESTER OF 5-BENZYLOXY-3-HYDROXY-3METHYLPENTANOIC ACID AND CONVERTING SAID ESTER TO 3,5DIHYDROXY-3-METHYLPENTANOIC ACID AND B-HYDROXY-BMETHYL-8-VALEROLACTONE (A) BY HYDROLYSIS OF THE ESTER GROUP AND (B) BY REMOVAL OF THE BENZYL GROUP BY HYDROGENATION.
Claim 3
Dependent Claim
19 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) 5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOIC ACID, (B) LOWER ALKYL 5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOATE, AND (C) N,N''-DIBENZYLETHYLENEDIAMMONIUM BIS(5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOATE).
Claim 4
Dependent Claim
19 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) 5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOIC ACID, (B) LOWER ALKYL 5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOATE, AND (C) N,N''-DIBENZYLETHYLENEDIAMMONIUM BIS(5-BENZYLOXY-3-HYDROXY-3-METHYLPENTANOATE).
References Cited (Backward Citations)
US2356153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |