US4540520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound useful in detecting ion and method of preparing it
Assignee: Bayer Corp
•
Filing: 1983-05-12
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Granted: 1985-09-10
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Expires: 2003-05-12
Abstract
Abstract A novel compound is disclosed having the structure <IMAGE> (I) in which R is lower alkyl and X is halogen or pseudohalogen. Also disclosed in a novel process for preparing the compound which comprises the steps of combining a compound having the structure <IMAGE> in which X is a halogen or pseudohalogen, and a compound having the structure <IMAGE> (III) in which R is lower alkyl and A is lower alkylidene to produce a first reaction mixture; adjusting the pH of the first reaction mixture to at least about 8 to produce a second reaction mixture; and recovering the compound or its salt from the second reaction mixture.
Inventors
- 👤 Steven C. Charlton
- 👤 Roger L. Fleming
- 👤 Authur L. Y. Lau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:31
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/84
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A compound having the structure ##STR10## in which R is lower alkyl and X is halogen or pseudohalogen.
Claim 2
Dependent Claim
18 words
A compound having the structure ##STR10## in which R is lower alkyl and X is halogen or pseudohalogen.
Claim 3
Dependent Claim
10 words
The compound of claim 1 in which R is methyl.
Claim 4
Dependent Claim
10 words
The compound of claim 2 in which X is Cl.
Claim 5
Dependent Claim
92 words
A process for preparing the compound of claim 1, the process comprising the steps of combining, in a nonaqueous solvent, a compound having the structure ##STR11## in which X is a halogen or pseudohalogen, and a compound having the structure ##STR12## in which R is lower alkyl and A is lower alkylidene, to produce a first reaction mixture; maintaining the pH of the first reaction mixture to at least about 8 to produce a second reaction mixture; and recovering the compound of claim 1 or its salt from the second reaction mixture.
Claim 6
Dependent Claim
21 words
The process of claim 4 in which the steps of recovering comprises lowering the pH to the range of about 2-4.
Claim 7
Dependent Claim
24 words
The process of claim 4 in which the step of combining comprises combining 2,5-dichloroquinone-4-chloroimide and N-[1'-(2'-methyl)naphthyl]aminoethanol and the compound of claim 1 is 2-methyl-4-(3',5'-dichlorophen-4'-one)indonaphth-1-ol.
References Cited (Backward Citations)
CA639191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |