US3869485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acid chlorides with phosgene in the presence of a catalyst
Assignee: Honeywell International Inc
•
Filing: 1969-09-25
•
Granted: 1975-03-04
•
Expires: 1989-09-25
Abstract
Abstract An improved process for the preparation of monocarboxylic acid halides by reaction of monocarboxylic acids, or anhydrides thereof, with phosgene in the presence of a benzimidazole or a benzotriazole as catalyst.
Inventors
- 👤 Richard C Delong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A PROCESS FOR THE PREPARATION OF A MONOCARBOXYLIC ACID CHLORIDE WHICH COMPRISES RREACTING A MONOCARBOXYLIC ACID OR ANHYDRIDE THEREOF WITH AT LEAST AN EQUIMOLECULAR PREPORTION OF PHOSGENE AT A TEMPERATURE BETWEEN ABOUT 100* TO ABOUT 180*C. IN THE PRESENCE OF ABOUT 0.5 TO 5 PERCENT, BY WEIGHT OF THE CARBOXYLIC ACID OR ANHYDRIDE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF, METHYLBENZIMIDAZOLE, AND METHYLBENZOTRIAZOLE.
Claim 2
Dependent Claim
65 words
A PROCESS FOR THE PREPARATION OF A MONOCARBOXYLIC ACID CHLORIDE WHICH COMPRISES RREACTING A MONOCARBOXYLIC ACID OR ANHYDRIDE THEREOF WITH AT LEAST AN EQUIMOLECULAR PREPORTION OF PHOSGENE AT A TEMPERATURE BETWEEN ABOUT 100* TO ABOUT 180*C. IN THE PRESENCE OF ABOUT 0.5 TO 5 PERCENT, BY WEIGHT OF THE CARBOXYLIC ACID OR ANHYDRIDE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF, METHYLBENZIMIDAZOLE, AND METHYLBENZOTRIAZOLE.
Claim 3
Dependent Claim
43 words
In a process for the preparation of a monocarboxylic acid chloride by reaction of phosgene with a monocarboxylic acid or anhydride the improvement which comprises reacting said phosgene and monocarboxylic acid or anhydride in the presence of a catalytic amount of methyl benzotriazole.
Claim 4
Dependent Claim
43 words
In a process for the preparation of a monocarboxylic acid chloride by reaction of phosgene with a monocarboxylic acid or anhydride the improvement which comprises reacting said phosgene and monocarboxylic acid or anhydride in the presence of a catalytic amount of methyl benzotriazole.
Claim 5
Dependent Claim
43 words
In a process for the preparation of a monocarboxylic acid chloride by reaction of phosgene with a monocarboxylic acid or anhydride, the improvement which comprises reacting said phosgene and monocarboxylic acid or anhydride in the presence of a catalytic amount of methyl benzimidazole.
Claim 6
Dependent Claim
43 words
In a process for the preparation of a monocarboxylic acid chloride by reaction of phosgene with a monocarboxylic acid or anhydride, the improvement which comprises reacting said phosgene and monocarboxylic acid or anhydride in the presence of a catalytic amount of methyl benzimidazole.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 2 wherein said carboxylic acid is lauric acid.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 3 wherein said carboxylic acid is benzoic acid.
References Cited (Backward Citations)
US3547960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |