Abstract
AbstractThe crystal structures of five 5,6‐disubstituted benzofurazan 1‐oxides are presented and compared with five previously reported structures: three polymorphs of 5,6‐dichlorobenzofurazan 1‐oxide plus 4,5‐dichloro‐ and 4,5‐dibromophthalic anhydride. All but one of these compounds pack with similar two‐dimensional layers. The benzofurazan oxides all show disorder about a crystallographic twofold or pseudo‐twofold axis. In addition, six complexes of phthalic anhydride and benzofurazan oxides are reported. With the packing in the complexes principally directed by the π complexing, the disorder, invariably found in the uncomplexed benzofurazan oxides, is diminished, and, in two cases, eliminated.
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