# US 4,391,991 A · Process for the preparation of para-fluoroaniline

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- Number: US 4,391,991 A
- Document ID: US4391991A
- Status: Granted
- Kind: A
- Application number: 06/316,199
- Filed: 1981-10-29
- Granted: 1983-07-05
- Earliest claimed: 1981-10-29
- Assignees: Occidental Chemical Corporation
- Inventors: Rudolph F. Mundhenke; Michael J. Fifolt
- Web page: https://patentgrep.com/patent/US4391991A

## CPC

- C07C 209/40: by reduction of hydroxylamino or oxyimino groups
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Para-fluoroaniline is prepared by reaction of N-phenylhydroxylamine with anhydrous hydrogen fluoride at atmospheric pressure and reflux conditions.

## Claims

### Claim 1

A process for the preparation of para-fluoroaniline comprising reacting N-phenylhydroxylamine with anhydrous hydrogen fluoride at atmospheric pressure and reflux conditions.

### Claim 2 (depends on 1)

A process according to claim 1 wherein the reactants are employed in a molar ratio of HF:N-phenylhydroxylamine of about 5:1 to about 40:1.

### Claim 3 (depends on 1)

A process according to claim 1 wherein the reactants are present in a molar ratio of HF:N-phenylhydroxylamine of about 15:1 to about 25:1.

### Claim 4 (depends on 2)

A process according to claim 2 carried out in the presence of a solvent.

### Claim 5 (depends on 4)

A process according to claim 4 wherein the solvent is methylene chloride.

### Claim 6 (depends on 1)

A process according to claim 1 wherein N-phenylhydroxylamine, dissolved in a solvent, is added to liquid hydrogen fluoride and the resultant reaction mixture is heated to reflux condition.

### Claim 7 (depends on 6)

A process according to claim 6 wherein the solvent is methylene chloride.

### Claim 8 (depends on 7)

A process according to claim 7 wherein the ratio of HF:N-phenylhydroxylamine is about 15:1 to about 25:1.