Bis(3,5-dimethyl-1H-pyrazole-κN)silver(I) hexa-fluorido-anti-monate.

The title compound, [Ag(C(5)H(8)N(2))(2)]SbF(6), contains an Ag(+) cation almost linearly bonded to two N atoms of dimethylpyrazole ligands [N-Ag-N = 176.54 (18)°]. The structure exhibits hydrogen bonding between the two dimethyl-pyrazole H atoms and two F atoms of one hexa-fluorido-anti-monate anion. Three relatively short Ag⋯F contacts [2.869 (6), 2.920 (7), and 3.094 (7) Å] exist between the cation and three different SbF(6) (-) anions. The crystal used for data collection was found to be twinned by non-merohedry, with the two components being related by a 180° rotation around the real or reciprocal a axis. Integration resulted in 11.2% of the total peaks being assigned to component 1, 11.2% to component 2, and 77.6% to both components.

(6R)-2-tert-Butyl-6-[(4R,5S)-3-isopropyl-4-methyl-5-phenyl-oxazolidin-2-yl]phenol.

In the title compound, C(23)H(31)NO(2), the lone pair on the nitro-gen atom is oriented to facilitate intra-molecular hydrogen bonding with the hydr-oxy group residing on the phenyl substituent. The five-membered ring adopts an envelope confornmation with the O atom at the flap. The absolute stereochemistry was verified by measurement of optical activity using a digital polarimeter.

(6S)-2,4-Di-tert-butyl-6-[(4S,5R)-3-iso-propyl-4-methyl-5-phenyloxazolidin-2-yl]phenol.

The title oxazolidine compound, C(27)H(39)NO(2), was synthesized from N-isopropyl-norephedrine. The dihedral angle between the aromatic rings is 70.33 (5)°. The N atom of the heterocycle is oriented to allow intra-molecular O-H⋯N hydrogen bonding with the hydr-oxy substituent.

(6S)-2-tert-Butyl-6-[(4S,5R)-3,4-dimethyl-5-phenyloxazolidin-2-yl]phenol.

The title compound, C(21)H(27)NO(2), exhibits hydrogen bonding between the phenolic H atom and the heterocyclic N atom. The absolute configuration of the mol-ecule is known from the synthetic procedure.

(5S)-4-(2,2-Dimethyl-prop-yl)-5-isopropyl-1,3,4-oxadiazinan-2-one.

The title compound, C(11)H(22)N(2)O(2), has one chiral center and packs in the monoclinic space group P2(1). The asymmetric unit has five crystallographically independent mol-ecules, four of which engage in inter-molecular N-H⋯O hydrogen bonding.

(5R,6S)-4-Isopropyl-5-methyl-6-phenyl-3-propanoyl-2H-1,3,4-oxadiazinan-2-one.

The title compound, C(16)H(22)N(2)O(3), was synthesized during the course of a study on (1R,2S)-norephedrine-derived 1,3,4-oxadiazinan-2-ones. The conformation adopted by the isopropyl group is pseudo-axial relative to the oxadiazinan core. The allylic strain contributes to this conformational arrangement.

(5S,6R)-5-Methyl-6-phenyl-4-propyl-1,3,4-oxadiazinane-2-thione.

The title mol-ecule, C(13)H(18)N(2)OS, is an oxadiazinanthione derived from (1R,2S)-norephedrine. There are two molecules in the asymmetric. Both adopt roughly half-chair conformations; however, the 5-position carbon orients out of opposite faces of the oxadiazinanthiones plane in the two molecules. In the crystal structure, they are oriented as a dimer linked by a pair of N-H⋯S hydrogen bonds. The absolute configuration has been established from anomalous dispersion and confirms the known stereochemistry based on the synthetic procedure.