Cycloaddition reactions of [SNS][AsF6] with potassium tricyanomethanide
摘要:
The reactions of 1, 2 and 3 equivalents of [SNS] [AsF6] with K[C(CN)3] in liquid SO2 generated three cycloaddition products (NC)2C activated CNSNS 1, [(NC)C(activated CNSNS)2][AsF6] 2 and [C(activated CNSNS)3] [AsF6]2.SO2 3. These were characterised by IR spectroscopy, cyclic voltammetry and elemental analysis. Compounds 1 and 3 were further characterised by N-14 and C-13 NMR, UV/VIS spectroscopy, X-ray crystallography and (for 1) mass spectroscopy. Compound 1 crystallises as polymeric sheets of dithiadiazole units held together through CN ... S interactions and with a dihedral angle of 117.3-degree between planes. Compound 3 shows three equivalent activated CNSNS rings attached to a central carbon atom, the dication possessing C3h symmetry. Molecular orbital calculations were used to deduce a probable reaction mechanism.