# US 5,350,865 A · Process for the preparation of difluorobenzodioxole and chlorofluorobenzodioxole

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- Number: US 5,350,865 A
- Document ID: US5350865A
- Status: Granted
- Kind: A
- Application number: 08/126,823
- Filed: 1993-09-24
- Granted: 1994-09-27
- Earliest claimed: 1992-10-02
- Assignees: Bayer Aktiengesellschaft
- Inventors: Karl-Erwin Schnalke; Josef Heinrich; Fritz Doring
- Web page: https://patentgrep.com/patent/US5350865A

## CPC

- C07D 317/46: condensed with one six-membered ring
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

A novel process for the preparation of benzodioxoles of the formula (I) ##STR1## in which Hal represents a chlorine atom or a fluorine atom, from dichlorobenzodioxole using stoichiometric quantities of anhydrous hydrofluoric acid.

## Claims

### Claim 1

A process for the preparation of a benzodioxole of the formula ( I ) ##STR8## in which Hal is a chlorine atom or a fluorine atom, which comprises metering into a dichlorobenzodioxole of the formula (II) ##STR9## a stoichiometric quantity of anhydrous hydrofluoric acid at a temperature between -10.degree. and room temperature and under pressure of between 1 and 10 bar.

### Claim 2 (depends on 1)

A process according to claim 1, wherein 2 mols of anhydrous hydrofluoric acid are employed per mol of dichlorobenzodioxole.

### Claim 3 (depends on 1)

A process according to claim 1, wherein 1 mol of anhydrous hydrofluoric acid is employed per mol of dichlorobenzodioxole.