Electron and X-Ray Diffraction Studies of 1,2,3,5-Dithiadiazolyl Radicals

Electron diffraction studies on 2 (R = CF3) (85CB3781) indicate that, in the gas phase, CF3.CNSSN is not associated (comparable to 2 in solution, Section IX.A) the ring is planar and the CF3 substituent has a negligible barrier to rotation about the C—C bond. 

Heterocyclic Bond Distances, Angles, and Intermolecular Sulfur-Sulfur Distances for 1,2,3,5-Dithiadiazolyls 

This isomerism conveniently illustrates the small energy difference there is between the a and /3 forms (the packing efficiency is similar with calculated densities of 1.635 and 1.66 gem-3 respectively). 

SO2 reacts with N2F4 only under photolysis conditions at 120°C (64IC1165), formation of [Ph.CNSSN][S02F3] has been proposed to proceed via [PHCNSSN]F3. This intermediate may be acyclic as found for 39 the latter acyclic material was isolated from an attempt to fluorinate 2 (R = Cl) with AgF2 (Section II.D.5). 

Reactions of 2 (93CC919) as a dehalogenating agent include attack at E—X bonds (E = B, P, Si, and activated C X = Cl, Br) with formation 

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