Abstract
The crystal structures of 1,1,3,3,5-pentamethyl-4,6-dinitroindan (1), 1,1,2,3,3,6-hexamethyl-5-nitroindan (2) and 1,1,2,3,3,5-hexamethyl-4,6-dinitroindan (3) have been established by X-ray crystallography. (1) and (3) are strong musks. Some of the structures described show disorder in the cyclopentene ring and/or in the nitro groups. This manifests itself in relatively high displacement parameters and in deviating bond distances and angles. The endocyclic angles of the cyclopentene ring, at the fusion with the aromatic ring, are significantly larger than reported in a study of the geometry of small rings [Allen (1981). Acta Cryst. B37, 900-906]
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