Patent US3553274A successfully refreshed from Google Patents.
US3553274A
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Process for the preparation of alkylated benzenes having halogen substituents in the 3,5- or 3,4,5-positions
Assignee: Rohm and Haas Co
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Filing: 1967-06-28
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Granted: 1971-01-05
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Expires: 1987-06-28
Abstract
Abstract ALKYL BENZENES IN WHICH THE ALKYL GROUP IS OF THE SECONDARY OR TERTIARY TYPE AND WHICH HAVE HALOGEN OR METHYL SUBSTITUENTS IN THE 2,4- OR 2,3,4-POSITIONS MAY BE CATALYTICALLY ISOMERIZED IN GOOD YIELD TO THE CORRESPONDING 3,5AND 3,4,5-SUBSTITUTED ALKYL BENZENES. CATALYSTS FOR THE ISOMERIZATION ARE HAIBRCL3, HALBR2CL2, HALBR3CL AND HALBR4. THE RESULTING PRODUCTS ARE OF PARTICULAR INTEREST AS PRECURSORS FOR THE CORRESPONDING BENZOIC ACIDS.
Inventors
- 👤 Sheldon N Lewis
- 👤 Golin Swithenbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:24
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/35; C07C17/358; C07C17/26; C07C17/263; C07C17/269; C07C37/00; C07C37/08; C07C51/00; C07C51/16; C07C51/27; C07C51/275
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |