S(C1C(F)=C(F)C(F)=C(F)C=1C(O)=O)(O)(=O)=O.FS(C1C(F)=C(F)C(F)=C(F)C=1C(F)=O)(=O)=O.[S:35]1[CH2:41][C:39](=[O:40])[NH:38][C:36]1=[S:37].[F:42][C:43]1[C:48]([CH:49]=O)=[C:47]([F:51])[C:46]([F:52])=[C:45]([F:53])[C:44]=1[F:54]>C(Cl)(Cl)Cl.C(N(CC)CC)C>[F:42][C:43]1[C:44]([F:54])=[C:45]([F:53])[C:46]([F:52])=[C:47]([F:51])[C:48]=1[CH:49]=[C:41]1[S:35][C:36](=[S:37])[NH:38][C:39]1=[O:40]Production of 2-sulpho tetrafluorobenzoic acid ##STR61## and 2-fluorosulphonyl tetrafluorobenzoyl fluoride ##STR62## 38 g of triethylamine were added dropwise to a well stirred suspension of 50 g of rhodanine and 70 g of pentafluorobenzaldehyde in 100 ml of chloroform, the temperature being held below 40° C. by external cooling. After one hour, the solution was washed with dilute HCl, then water. The solvent was removed and the resultant yellow residue recrystallised from IMS/water to give 82 g of 2,3,4,5,6-pentafluorobenzylidene rhodanine having a melting point of 132-135° C.
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