# US 7,745,648 B2 · Process for preparing 4-fluoro-1,3-dioxolan-2-one

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- Number: US 7,745,648 B2
- Document ID: US7745648B2
- Status: Granted
- Kind: B2
- Application number: 11/210,868
- Filed: 2005-08-25
- Published: 2006-02-16
- Granted: 2010-06-29
- Earliest claimed: 2003-02-26
- Assignees: Solvay Fluor GmbH
- Inventors: Olaf Boese; Dirk Seffer; Katja Peterkord
- Web page: https://patentgrep.com/patent/US7745648B2

## CPC

- C07D 317/42: Halogen atoms or nitro radicals
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

A process for preparing 4-fluoro-1,3-dioxolan-2-one comprising adding 4-fluoro-1,3-dioxolan-2-one to ethylene carbonate in an amount of from 3 to 20% by weight relative to the ethylene carbonate as a solvent for the ethylene carbonate, and introducing fluorine or a mixture containing fluorine in an inert gas is introduced into the resulting solution at 15 to 45° C.

## Claims

### Claim 1

A process for preparing 4-fluoro-1,3-dioxolan-2-one by reaction of ethylene carbonate with elemental fluorine, said process comprising:
mixing ethylene carbonate in a reaction vessel with 3-20% by weight 4-fluoro-1,3-dioxolan-2-one relative to the ethylene carbonate as a solvent for the ethylene carbonate, whereby a solution of ethylene carbonate in 4-fluoro-1,3-dioxolan-2-one is formed, and
thereafter introducing fluorine gas or a mixture containing fluorine in an inert gas into the resulting solution at a temperature of 15 to 45° C.

### Claim 2 (depends on 1)

A process according to claim 1, wherein from 4 to 14% by weight of 4-fluoro-1,3-dioxolan-2-one relative to the ethylene carbonate is mixed with the ethylene carbonate as solvent for the ethylene carbonate.

### Claim 3 (depends on 1)

A process according to claim 1, wherein no further solvents are added to the reaction.

### Claim 4 (depends on 1)

A process according to claim 1, wherein the reaction is carried out at a temperature below the melting point of ethylene carbonate.

### Claim 5 (depends on 1)

A process according to claim 1, wherein fluorine is used in a hypostoichiometric amount relative to the amount of ethylene carbonate present.

### Claim 6 (depends on 5)

A process according to claim 5, wherein the amount of fluorine is from 60 to 95 mole % of the amount of ethylene carbonate present.

### Claim 7 (depends on 1)

A process according to claim 1, further comprising recycling unreacted ethylene carbonate.