Z,Z Isomers of Polyfluorinated 1,3-Bis(aryl)-1,3-diaza-2-thiaallenes, (ArN=)2S, in the Crystal and in Solution

It has been shown by X-ray structure analysis, ¹⁹F NMR spectroscopy and PM3 calculations that non-typical (it is assumed) Z,Z isomers of (ArN=)₂S, discovered only recently in the form of sterically hindered derivatives, are unexpectedly widespread being found for the title compounds as well.