Patent US3320286A successfully refreshed from Google Patents.
US3320286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 2, 2-dimethyl-7-benzofuranol
Assignee: FMC Corp
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Filing: 1965-03-01
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Granted: 1967-05-16
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Franko-Filipasic Boriv Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:13
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07C; C07C205/00; C07C205/13; C07C205/20; C07C205/21; C07C205/22; C07C205/27; C07C205/35; C07C205/36; C07C205/37; C07D307/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS OF PREPARING 2,3-DIHYDRO-2,2-DIMETHYL-7BENZOFURANOL WHICH COMPRISES (A) REACTING O-NITROPHENOL WITH A METHALLYL HALIDE TO FORM O-METHALLYLOXYNITROBENZENE, (B) REARRANGING O-METHALLYLOXYNITROBENZENE TO AN ISOMER SELECTED FROM THE GROUP CONSISTING OF 2-NITRO-6METHALLYLPHENOL AND 2-NITRO-6-ISOBUTENYLPHENOL, (C) CYCLIZING SAID ISOMER TO 2,3-DIHYDRO-2,2-DIMETHYL7-NITROBENZOFURAN, (D) REDUCING 2,3 - DIHYDRO-2,2-DIMETHYL-7-NITROBENZOFURAN TO 7 - AMINO-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN, (E) DIAZOTIZING 7 - AMINO-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN TO A SALT OF 7-DIAZONIUM-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN, (F) HYDROLYZING THE SALT OF 7-DIAZONIUM-2,3-DIHYDRO2,2-DIMETHYLBENZOFURAN TO 2,3-DIHYDRO-2,2-DIMETHYL7-BENZOFURANOL.
Claim 2
Dependent Claim
65 words
A PROCESS OF PREPARING 2,3-DIHYDRO-2,2-DIMETHYL-7BENZOFURANOL WHICH COMPRISES (A) REACTING O-NITROPHENOL WITH A METHALLYL HALIDE TO FORM O-METHALLYLOXYNITROBENZENE, (B) REARRANGING O-METHALLYLOXYNITROBENZENE TO AN ISOMER SELECTED FROM THE GROUP CONSISTING OF 2-NITRO-6METHALLYLPHENOL AND 2-NITRO-6-ISOBUTENYLPHENOL, (C) CYCLIZING SAID ISOMER TO 2,3-DIHYDRO-2,2-DIMETHYL7-NITROBENZOFURAN, (D) REDUCING 2,3 - DIHYDRO-2,2-DIMETHYL-7-NITROBENZOFURAN TO 7 - AMINO-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN, (E) DIAZOTIZING 7 - AMINO-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN TO A SALT OF 7-DIAZONIUM-2,3-DIHYDRO-2,2-DIMETHYLBENZOFURAN, (F) HYDROLYZING THE SALT OF 7-DIAZONIUM-2,3-DIHYDRO2,2-DIMETHYLBENZOFURAN TO 2,3-DIHYDRO-2,2-DIMETHYL7-BENZOFURANOL.
References Cited (Backward Citations)
US2312801A
Cited
US3213112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |