Pentafluorobenzaldehyde → 2,3,4,5,6-Pentafluorobenzylidene rhodanine

Beteiligte Stoffe

Reaktionsschritte

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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