Aug. 14, 2008  11  US 2008/0194886 Al  -continued  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.  EXAMPLES  Preparation of 1,3,5-trifluorobenzene  [0194]  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- Cl  F  c,nc,  KF  c,nc,  cat.  210°  C.  sulfolane  TCB  FDCB  Results  Test  Catalysts  YieldorPNFB  Nothing  5.87%  2  [(CH 3 )oNhPNP[N(CH 3 hh,BF$_{4}$ _  10.60%  3  [(CH 3 JoNhPNPBu 3 ,Br- 15.77%  4  Ph 3 PNPBu 3 ,Br- 28.00%  5  [(CH 3 )oN] 3 PNP[N(CH 3 )o] 3 ,Br- 20.04%  6  Ph 3 PNP[N(CH 3 Joh,Br- 45.50%  7  Ph 3 PNP(( o )-MeOPhh,Br- 37.82%  8  Bu 3 PNPBu 3 ,Br- 41.83%  Test  2  3  4  5  6  Mass  Charge table  eq  eq  Kf  sulfolane  Massing  to  to  Catalyst  of  eq cat. to  TCBg  TCB  TCB  nature  catalyst  TCB  1.541  2.07  2.25  Nothing  0  0  1.5030  2.08  2.02  [(CH 3 JoNhPNPBu 3 ,  0.1579  0.041  Br- 1.5076  2.01  2.03  Ph 3 PNPBu 3 , Br- 0.1860  0.040  1.5095  1.99  2.02  [(CH 3 )oN] 3 PNP[N(CH3)o]3,  0.1408  0.040  Br- 1.4929  1.99  2.09  Ph 3 PNP[N(CH3)oh,  0.1767  0.049  Br- 1.0082  2.08  2.29  Bu 3 PNPBu 3 , Br- 0.1616  0.058  Results  Test  Catalysts  RYDCFB  RYDFCB  Nothing  <0.5%  <0.5%  2  [(CH 3 )$_{2}$NhPNPBu 3 ,Br  25.39%  1.04%  3  Ph 3 PNPBu 3 ,Br- 15.70%  0.24%  4  [(CH 3 )$_{2}$NhPNP[N(CH 3 hh,Br- 38.95%  2.73%  5  Ph 3 PNP[N(CH 3 )o] 3 ,Br- 25.24%  1.48%  6  Bu 3 PNPBu 3 ,Br- 11.55%  1.28% 