| Abstract: | Crystal structures have been determined of methyl trans-1-hydroxy-6-nitro-3-oxobicyclo[4.4.0]decane-2-carboxylate ( 19 ), cis-3-methyl-6-nitro-2-oxabicyclo[4.4.0]decan-1-ol ( 2 ), cis-7-hydroxy-1-nitrobicyclo[5.4.0]undecan-9-one ( 13 ), and the medium-ring compounds 2-acetyl-4-nitrocyclooctanone ( 9 ), methyl 5-nitro-2-oxocyclooctane-carboxylate ( 4 ), 2-acetyl-4-nitrocyclononanone ( 11 ), 2-acetyl-4-nitrocyclodecanone ( 15 ), benzyl 5-nitro-2,11-dioxocycloundecanecarboxylate ( 24 ), methyl 5-nitro-2,12-dioxocyclododecanecarboxylate ( 21 ), and 8-nitro-11-oxo-13-tridecanolide ( 7 ), which are intermediates, side products, or end products of the ‘Zip’ ring-enlargement reaction. The conformations of most of the medium-ring compounds are very similar to equal-sized ring compounds previously determine by other authors. |
