Process for the preparation of p-bromofluorobenzene
AssigneeBromine Compounds Ltd.
InventorJakob Oren
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Abstract
Process for the production of p-bromofluorobenzene by the bromination of fluorobenzene, characterized in that the bromination is carried out with liquid bromine at temperatures below 0.degree. C.
Claims14
Process for the production of p-bromofluorobenzene with high purity and high yield by the bromination of fluorobenzene, comprising:
- stirring a reaction mixture of fluorobenzene and liquid bromine at temperatures below about -20.degree. C. so that said fluorobenzene and said liquid bromine react to form said p-bromofluorobenzene;
- and
- maintaining said temperature below about -20.degree. C. during the entire reaction of said fluorobenzene with said liquid bromine.
Process according to claim 9, wherein said dichloromethane or dibromomethane is used in a weight ratio to the fluorobenzene of 1:1.
Process for the production of p-bromoflulorobenzene with high purity and high yield by the bromination of fltuorobenzene, comprising:
- stirring a reaction mixture of fluorobenzene and liquid bromine at temperatures below about -38.degree. C. so that said fluorobenzene and said liquid bromine react to form said p-bromoflulorobenzene;
- and
- maintaining said temperature below about -40.degree. C. during the entire reaction of said fluorobenzene with said liquid bromine.
The process for the production of p-bromofluorobenzene with high purity and high yield by the bromination of fluorobenzene, comprising:
- stirring a reaction mixture comprising fluorobenzene and liquid bromine in the absence of a solvent at temperatures between about 0.degree. C. and about -20.degree. C. so that said fluorobenzene and said liquid bromine react to form said p-bromofluorobenzene;
- and
- maintaining said temperature between about 0.degree. C. and about -20.degree. C. during the entire reaction of said fluorobenzene with said liquid bromine.
Dependencies are inferred from the claim text.