Patent US4925966A successfully refreshed from Google Patents.
US4925966A
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Process for producing trifluorobenzene compounds
Assignee: SDS Biotech Corp
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Filing: 1988-09-14
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Granted: 1990-05-15
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Expires: 2008-09-14
Abstract
Abstract A trifluorobenzene compound represented by the general formula (I): ##STR1## wherein Z represents a cyano group or a carboxyl group, and a process for producing said compounds.
Inventors
- 👤 Hiroshi Kobayashi
- 👤 Masaaki Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:29
CPC Classifications
C; C07; C07C; C07C255/00; C07C63/00; C07C63/68
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A process for producing 2,4,5-trifluoroisophthalonitrile which comprises reacting tetrafluoroisophthalonitrile with a metal hydride at a temperature between -80° and 100° C. in an aprotic solvent.
Claim 2
Dependent Claim
25 words
A process for producing 2,4,5-trifluoroisophthalonitrile which comprises reacting tetrafluoroisophthalonitrile with a metal hydride at a temperature between -80° and 100° C. in an aprotic solvent.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, wherein the reaction temperature is between -70° and 40° C.
Claim 4
Dependent Claim
33 words
A process as claimed in claim 1, wherein said metal hydride is selected from the group consisting of hydrides of boron, aluminum, silicon or tin, lithium aluminum hydride, sodium borohydride and hydrogenated organoaluminum.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1 wherein said metal hydride is sodium borohydride or hydrides of boron.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 1, wherein said metal hydride is used in an amount of 1.1-3.0 equivalents in terms of hydrogen anion per mole of tetrafluoroisophthalonitrile.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1, wherein said metal hydride is sodium borohydride and said aprotic solvent is tetrahydrofuran or acetonitrile.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |