Patent US4492657A successfully refreshed from Google Patents.
US4492657A
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Imines of alkyl 4-halomethylbenzoates
Assignee: Hoechst AG
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Filing: 1983-04-25
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Granted: 1985-01-08
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Expires: 2003-04-25
Abstract
Abstract New alkyl (4-halomethyl)iminobenzoates of the formula ##STR1## and their HCl or HBr salts, R denoting C 1 -C 4 -alkyl or C 1 -C 4 -alkoxyethyl and X denoting Cl or Br. These compounds are prepared by reaction of p-cyanobenzyl chloride or p-cyanobenzyl bromide with a C 1 -C 4 -alcohol or C 1 -C 4 -alkoxyethanol in the presence of hydrogen chloride or bromide. The new imines serve as intermediate products, inter alia for the preparation of optical brighteners of the bisbenzoxazolylstilbene class.
Inventors
- 👤 Lorenz Heiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:25
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; C07C257/00; C07C257/04; C07C257/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
An alkyl (4-halomethyl)iminobenzoate of the formula ##STR3## and its HCl or HBr salts, R denoting C 1 -C 4 -alkyl or C 1 -C 4 -alkoxymethyl and X denoting Cl or Br.
Claim 2
Dependent Claim
32 words
An alkyl (4-halomethyl)iminobenzoate of the formula ##STR3## and its HCl or HBr salts, R denoting C 1 -C 4 -alkyl or C 1 -C 4 -alkoxymethyl and X denoting Cl or Br.
References Cited (Backward Citations)
US2389681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |