US4077977A
Expired / Lapsed
US
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Ethenoanthracenes
Assignee: EIDP Inc
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Filing: 1976-05-27
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Granted: 1978-03-07
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Expires: 1996-05-27
Abstract
Abstract Compounds of the formula: ##STR1## where R 1 and R 2 are various substituents and X is a bridge having a chain of 3 atoms, including N, are made by internal Diels-Alder reaction of alkynyl-substituted anthracenes. The compounds are useful as inhibitors of free radical vinyl polymerization.
Inventors
- 👤 Engelbert Ciganek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/58; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A compound of the formula: ##STR16## wherein R 1 and R 2 , alike or different, are selected from hydrogen, lower alkyl, lower perfluoroalkyl, halogen, lower alkoxy, lower alkylthio, lower perfluoroalkylthio, acyl of 1-4 carbon atoms, lower alkylsulfonyl, lower perfluoroalkylsulfonyl, di(lower alkyl)aminosulfonyl, sulfamyl, amino, lower alkylamino, and di(lower alkyl)amino; with the proviso that at least one of R 1 and R 2 is hydrogen; X is a linear chain of 3 atoms, which contains one central atom of nitrogen, the remaining atoms being carbon substituted with hydrogen; where N is substituted with H, alkyl of up to 12 carbon atoms, alkenyl of 3-4 carbon atoms attached to N by a saturated carbon atom, cycloalkyl of 3-9 carbon atoms, cycloalkenyl, cycloalkyl lower alkyl, cycloalkenyl lower alkyl, phenyl lower alkyl, adamantylmethyl, benzyl, α-furylmethyl, α-thienylmethyl, or α-phenylethyl.
Claim 2
Dependent Claim
134 words
A compound of the formula: ##STR16## wherein R 1 and R 2 , alike or different, are selected from hydrogen, lower alkyl, lower perfluoroalkyl, halogen, lower alkoxy, lower alkylthio, lower perfluoroalkylthio, acyl of 1-4 carbon atoms, lower alkylsulfonyl, lower perfluoroalkylsulfonyl, di(lower alkyl)aminosulfonyl, sulfamyl, amino, lower alkylamino, and di(lower alkyl)amino; with the proviso that at least one of R 1 and R 2 is hydrogen; X is a linear chain of 3 atoms, which contains one central atom of nitrogen, the remaining atoms being carbon substituted with hydrogen; where N is substituted with H, alkyl of up to 12 carbon atoms, alkenyl of 3-4 carbon atoms attached to N by a saturated carbon atom, cycloalkyl of 3-9 carbon atoms, cycloalkenyl, cycloalkyl lower alkyl, cycloalkenyl lower alkyl, phenyl lower alkyl, adamantylmethyl, benzyl, α-furylmethyl, α-thienylmethyl, or α-phenylethyl.
Claim 3
Dependent Claim
42 words
A compound of claim 1 having the formula: ##STR17## wherein X is --CH 2 -- NR 3 -- CH 2 -- and R 3 is H, alkyl of up to 12 carbon atoms, cycloalkylmethyl of 4 to 10 carbon atoms or benzyl.
Claim 4
Dependent Claim
14 words
The compound of claim 2 wherein R 1 and R 2 are each hydrogen.
Claim 5
Dependent Claim
17 words
The compound of claim 2 wherein R 3 is cycloalkyl methyl of 4 to 10 carbon atoms.
Claim 6
Dependent Claim
11 words
The compound of claim 4 wherein R 3 is cyclobutyl methyl.
Claim 7
Dependent Claim
11 words
The compound of claim 4 wherein R 3 is cyclopentyl methyl.
Claim 8
Dependent Claim
11 words
The compound of claim 4 wherein R 3 is cyclohexyl methyl.
Claim 9
Dependent Claim
11 words
The compound of claim 4 wherein R 3 is cycloheptyl methyl.
Claim 10
Dependent Claim
11 words
The compound of claim 2 wherein R 3 is lower alkyl.
Claim 11
Dependent Claim
11 words
The compound of claim 3 wherein R 3 is cyclopentyl methyl.
Claim 12
Dependent Claim
10 words
The compound of claim 2 wherein R 3 is hydrogen.
References Cited (Backward Citations)
US3123618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |