SYNTHESIS AND PROPERTIES OF DIFLUORODITHIOPHOSPHORIC ACID

Difluorodithiophosphoric acid, a volatile monomeric compound (bp 72°), has been synthesized by either (1) reaction of iodothiophosphoryl difluoride with hydrogen sulfide or (2) reaction of hydrothiophosphoryl difluoride with sulfur. The acid is slowly hydrolyzed by water and it reacts with chlorine and hydrogen iodide but not with iodine, air, methyl mercaptan, or iodothiophosphoryl difluoride. Amines form salt-like adducts from which the acid is not displaced by hydrogen chloride indicating that the acid is a strong one. Nmr spectra indicate rapid proton exchange in solution. Infrared spectra and mass spectra are reported. © 1969, American Chemical Society. All rights reserved.