US3879416A
Expired / Lapsed
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Method for preparing indazolone derivatives
Assignee: Olin Corp
•
Filing: 1972-07-03
•
Granted: 1975-04-22
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Expires: 1992-07-03
Abstract
Abstract Preparation of indazolone compounds and derivatives thereof by reacting selected azobenzene or azoxybenzene compounds with carbon monoxide in the presence of a metal halide-Lewis base catalyst complex.
Inventors
- 👤 Theodore C Kraus
- 👤 Manfred G Noack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:35
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/54; C07D231/56; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
38 words
A METHOD FOR PREPARING AN INDAZOLONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF 2-PHENYLINDAZOLONE, BENZOLYLENE INDAZOLONE AND SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES REACTING A. AN AZO OR AZOXY COMPOUND HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Independent Claim
38 words
A METHOD FOR PREPARING AN INDAZOLONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF 2-PHENYLINDAZOLONE, BENZOLYLENE INDAZOLONE AND SUBSTITUTED DERIVATIVES THEREOF WHICH COMPRISES REACTING A. AN AZO OR AZOXY COMPOUND HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
Claim 3
Dependent Claim
8 words
R - N = N - R'', AND
Claim 4
Dependent Claim
8 words
R - N = N - R'', AND
Claim 5
Independent Claim
38 words
A method for preparing an indazolone compound selected from the group consisting of 2-phenylindazolone, benzolylene indazolone and substituted derivatives thereof which comprises reacting A. an azo or azoxy compound having a formula selected from the group consisting of:
Claim 6
Independent Claim
38 words
A method for preparing an indazolone compound selected from the group consisting of 2-phenylindazolone, benzolylene indazolone and substituted derivatives thereof which comprises reacting A. an azo or azoxy compound having a formula selected from the group consisting of:
Claim 7
Dependent Claim
7 words
R - N N - R'', and
Claim 8
Dependent Claim
7 words
R - N N - R'', and
Claim 9
Dependent Claim
1 words
R-N(=O)=N-R''
Claim 10
Dependent Claim
1 words
R-N(=O)=N-R''
Claim 11
Dependent Claim
32 words
The method of claim 1 wherein said halide or pseudo halide is selected from the group consisting of chloride, bromide, iodide, fluoride, NCS , SCN , CN , NCO and OCN .
Claim 12
Dependent Claim
48 words
The method of claim 2 wherein said alkyl group contains from 1 to 4 carbon atoms, said aryl group contains 6 to 8 carbon atoms, said aralkyl and alkylaryl contains from 6 to 14 carbon atoms and said alkoxy and alkylthio contains from 1 to 4 carbon atoms.
Claim 13
Dependent Claim
27 words
The method of claim 3 wherein the proportion of said catalyst is between about 0.01 and about 500 percent by weight of said azo or azoxy compound.
Claim 14
Dependent Claim
20 words
The method of claim 4 wherein X is a halide selected from the group consisting of chloride, bromide and iodide.
Claim 15
Dependent Claim
65 words
The method of claim 3 wherein said elevated temperature is in the range of between about 50* and about 400*C. said elevated pressure is in the range of between about 30 and about 15,000 psig. and the proportion of carbon monoxide is in the range of between about 1 and about 50 moles of carbon monoxide per nitrogen atom in the azo or azoxy compound.
Claim 16
Dependent Claim
21 words
The method of claim 6 wherein said azo or azoxy compound is selected from the group consisting of azobenzene and azoxybenzene.
Claim 17
Dependent Claim
27 words
The method of claim 7 wherein the proportion of said catalyst is between about 0.01 and about 500 percent by weight of said azo or azoxy compound.
Claim 18
Dependent Claim
20 words
The method of claim 8 wherein X is a halide selected from the group consisting of chloride, bromide and iodide.
References Cited (Backward Citations)
US2944056A
Cited
US3657308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |