Chemistry of 1,3-dioxepins : XVI. The synthesis, characterization and crystallographic analysis of some arylsulphanyl-, arylsulphinyl-, arylsulphonyl- and benzoyl- N-substituted derivatives of 1a,2,6,6a-tetrahydro-1H,4H-[1,3]dioxepino[5,6-b]azirines - Prugovečki, Biserka (Array, 2006)