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[0194] 

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## Preparation of 1,3,5-trifluorobenzene 

## EXAMPLES 

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Procedure 

[0195] The following are introduced in order into a 30 ml Schott tube: 

[0196] 1,3,5-trichlorobenzene 

[0197] the catalyst 

[0198] KF 

[0199] sulfolane. 

[0200] The tubes are closed with a septum and screw stop› per, and are then heated with stirring for 3 hours at 210° C. After cooling to room temperature, about 10 g of water are added, followed by 5 g of dichloromethane, then 5 g of dichloromethane again, and, after settling of the phases and separation of the organic and aqueous phases, the aqueous phase is back-extracted twice with 5 g of dichloromethane. The various organic phases are combined and analyzed by GC. 

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Synthesis of Catalysts 

[0201] The reactivity and polyvalency of (R$_{1}$ ) (R$_{2}$ ) (R$_{3}$ ) Pn=ZH, and of the alkali metal salts thereof (where appropri- 

-continued 

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