The synthesis of tetrafluoro-sulphobenzoic acids and their derivatives

Add time:09/06/2019    Source:sciencedirect.com

The tetrafluorosulphobenzoic acids 1,2-HO2C.C6F4.SO3H (I) and 1,4-HO2C.C6F4.SO3H (II) have been synthesised [1] by oxidation of respectively 4,5,6,7-tetrafluorobenzo [b] thiophen- 2-carboxylic acid (III) [2] and 4-mercaptotetrafluorobenzoic acid (IV) [3].By-products were obtained when (III) was oxidised with either trifluoroperacetic acid or potassium permanganate.A number of reactions of these intermediates have been investigated and the products characterized, eg reaction of (I) with SoCl2 gave tetrafluoro-1,2-sulphobenzoic acid cyclic anhyride (V). Although no significant change was observed when (II) was similarly treated reaction of (II) with DMF/SOCl2 gave 1,4-Cl.C6F4.COCl. The diacid fluorides 1,2-FOC.C6F4.SO2F (VI) and 1,4-FOC.C6F4.SO2F (VII) were obtained when (I) and (II) respectively were reacted with sulphur tetrafluoride. The use of excess SF4 gave 1,2- or 1,4- [F3C.C6F4.SO2F].

We also recommend Trading Suppliers and Manufacturers of 3-sulphobenzoic acid (cas 121-53-9). Pls Click Website Link as below: cas 121-53-9 suppliers

Prev:Acidic and non-acidic products from the photo-oxidation of the crude oil component dibenzothiophene dissolved in seawater
Next:Surface and interface properties of Benzethonium chloride (cas 121-54-0)-montmorillonite)