US4935562A
Expired / Lapsed
US
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Method for producing 4,4'-dibromobiphenyl
Assignee: Tosoh Corp
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Filing: 1988-12-07
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Granted: 1990-06-19
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Expires: 2008-12-07
Abstract
Abstract A method for producing 4,4'-dibromobiphenyl, which comprises reacting biphenyl and from 2 to 3 mol times, relative to biphenyl, of bromine in a halogenated hydrocarbon solvent in the presence of a catalyst which is a simple substance of an element selected from the group consisting of antimony, titanium, tin and zinc, or a compound of the element.
Inventors
- 👤 Fumio Okisaki
- 👤 Masashige Kubo
- 👤 Satoshi Fujii
- 👤 Kiyotaka Oyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10; C07C17/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A method for producing 4,4'-dibromobiphenyl, which comprises reacting biphenyl and from 2 to 3 mol times, relative to biphenyl, of bromine in a halogenated hydrocarbon solvent in the presence of a catalyst which is a metal selected from the group consisting of antimony, titanium, tin and zinc, or a halide, oxide, hydroxide, or inorganic or organic acid salt of said metal.
Claim 2
Independent Claim
61 words
A method for producing 4,4'-dibromobiphenyl, which comprises reacting biphenyl and from 2 to 3 mol times, relative to biphenyl, of bromine in a halogenated hydrocarbon solvent in the presence of a catalyst which is a metal selected from the group consisting of antimony, titanium, tin and zinc, or a halide, oxide, hydroxide, or inorganic or organic acid salt of said metal.
Claim 3
Dependent Claim
26 words
The method according to claim 1, wherein the catalyst is a halide, oxide, hydroxide, or inorganic or organic acid salt of antimony, titanium, tin or zinc.
Claim 4
Dependent Claim
19 words
The method according to claim 1, wherein the catalyst is antimony chloride, titanium chloride, tin chloride or zinc chloride.
Claim 5
Dependent Claim
24 words
The method according to claim 1, wherein the catalyst is used in an amount of from 0.1 to 10 mol % relative to biphenyl.
Claim 6
Dependent Claim
28 words
The method according to claim 1, wherein the solvent is chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, dichloromethane, chloroform, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1,2,2-tetrachloroethane, tetrachloroethylene, 1-chloropropane, 2-chloropropane, 1,2-dichloropropane or 1,3-dichloropropane.
Claim 7
Dependent Claim
19 words
The method according to claim 1, wherein the initial concentration of biphenyl is from 10 to 100 wt/vol %.
Claim 8
Dependent Claim
19 words
The method according to claim 1, wherein the biphenyl solution is at temperature of from 0 to 40° C.
References Cited (Backward Citations)
US1835754A
Cited
US3285965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |