title: (±)-2'-Phenyl-cyclo-hexa-nespiro-4'-(aze-pano[1,2-b]isoxazolidine).
abstract: In the crystal structure of the racemic title isoxazolidine, C(19)H(27)NO, the relative stereochemistry between the phenyl group and the bridgehead H atom is shown to be syn. There are two mol-ecules in the asymmetric unit, one of which is the 7R*,13R* enanti-omer, and one of which is the 7S*,13S* enanti-omer. These enanti-omers adopt different orientations of the phenyl ring with respect to the isoxazolidine ring, with C-C-C-C torsion angles of 63.6 (4) and 86.8 (4)°, respectively. In both enanti-omers, the six-membered ring adopts a chair conformation, while the seven-membered ring adopts a twist-chair conformation.
authors.affiliation: Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Daryl
authors.initials: D
authors.lastname: Crimmins
authors.forename: Ka Wai
authors.initials: KW
authors.lastname: Choi
authors.forename: Peter D W
authors.initials: PD
authors.lastname: Boyd
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Brimble