Primäre Amine reagieren mit 6‐Amino‐thiopyranthionen‐(2) 1 oder deren S‐Methylderivaten 2 unter Ringumwandlung zu 1‐substituierten 6‐Amino‐pyridinthionen 6. Mit Hydroxylamin gelangt man so zu 2‐Aminopyridin‐N‐oxiden, mit Hydrazin zu 1,2‐Diaminopyridinthionen‐(2), die mit salpetriger Säure Desaminierung, mit Ameisensäure eine Umlagerung zu 2‐Amino‐6‐rhodanopyridinen erleiden. Anilin reagiert nur mit 2 zu isolierbaren 6‐Aminothiopyron‐2‐iminen 3, die sich ebenfalls zu Pyridinthionen umlagern lassen. Sekundäre Amine liefern mit 1 2‐Amino‐6‐mercapto‐pyridine 14.
In the crystal structure of the title compound, C12H12N2, the molecule is twisted around the central C—C bond, with a dihedral angle of 8.32 (5)° between the mean planes of the pyridyl rings. The crystal structure is stabilized by arene stacking interactions, with a distance of 3.81 (1) Å between the ring centroids.
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