title: (4aR,9R,9aR)-7-Bromo-9-nitro-methyl-2,3,4,4a,9,9a-hexa-hydro-1H-xanthen-1-one.
abstract: The title compound, C14H14BrNO4, contains a tricyclic ring system including three contiguous stereocenters all of which exhibit an R configuration. The cyclo-hexa-none ring adopts a chair conformation. The central oxane ring assumes a strained envelope conformation, with five of the ring atoms being nearly coplanar with the bromo-phenyl group and with the C atom adjacent to the O atom and fused with the cyclo-hexa-none ring as the flap. In the crystal, mol-ecules are linked into a three-dimensional network by C-H⋯O inter-actions.
authors.affiliation: State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wu
authors.forename: Yan-Jun
authors.initials: YJ
authors.lastname: Guo
authors.forename: Ai-Bao
authors.initials: AB
authors.lastname: Xia