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US4138568A
Expired / Lapsed
US
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Process for the manufacture of benzimidazolones-(2)
Assignee: BASF Corp
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Filing: 1977-05-31
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Granted: 1979-02-06
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Expires: 1997-05-31
Abstract
Abstract Process for the manufacture of benzimidazolones-(2) wherein an o-phenylenediamine is reacted with optionally alkylated urea in the ratio of 1 to 1.3 moles per mole o-phenylenediamine in an organic solvent which has a solubility in water of not more than 5 g/l and has a boiling point above 100° C, at a temperature between 100° and 200° C.
Inventors
- 👤 Stefan Hari
- 👤 Ernesto Rinaldi
- 👤 Josef Somlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:51
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/24; C07D235/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A process for the manufacture of nitrobenzimidazolones-(2) which comprises reacting an O-phenylenediamine of the formula ##STR7## wherein R represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, phenyl or phenyl substituted by a chlorine atom, by a bromine atom, by an alkyl of 1 to 4 carbon atoms or by alkoxy of 1 to 4 carbon atoms, and X represents a nitro group, with urea, N-alkylurea with alkyl of 1 to 4 carbon atoms or N,N'-dialkylurea with alkyl of 1 to 4 carbon atoms in the ratio of 1 to 1.3 moles of urea or alkylated urea per mole of O-phenylenediamine in a halogenated benzene organic solvent, which has a solubility in water of not more than 5 g/l and has a boiling point above 100° C, at a temperature between 100° and 200° C.
Claim 2
Dependent Claim
139 words
A process for the manufacture of nitrobenzimidazolones-(2) which comprises reacting an O-phenylenediamine of the formula ##STR7## wherein R represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, phenyl or phenyl substituted by a chlorine atom, by a bromine atom, by an alkyl of 1 to 4 carbon atoms or by alkoxy of 1 to 4 carbon atoms, and X represents a nitro group, with urea, N-alkylurea with alkyl of 1 to 4 carbon atoms or N,N'-dialkylurea with alkyl of 1 to 4 carbon atoms in the ratio of 1 to 1.3 moles of urea or alkylated urea per mole of O-phenylenediamine in a halogenated benzene organic solvent, which has a solubility in water of not more than 5 g/l and has a boiling point above 100° C, at a temperature between 100° and 200° C.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein an unsubstituted urea is used as reactant.
Claim 4
Dependent Claim
39 words
A process according to claim 1, wherein a start is made from an o-phenylenediamine of the formula ##STR8## wherein R 1 represents a hydrogen atom, a methyl group or a phenyl group, and X 1 represents a nitro group.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein 1 to 2 moles of solvent are used referred to 1 mole of diamine.
Claim 6
Dependent Claim
14 words
A process according to claim 4, wherein the halogenated benzene is chlorobenzene or o-dichlorobenzene.
Claim 7
Dependent Claim
20 words
A process according to claim 1, wherein the reaction is carried out at a temperature between 135° and 180° C.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |