Sai Kumar Chakka

(R)-4-Phenyl-2-[(S)-1,2,3,4-tetra-hydro-isoquinolin-3-yl]-4,5-dihydro-1,3-oxazole.

The asymmetric unit cell of the title compound, C18H18N2O, contains four molecules. In the crystal structure, an intermolecular N—H⋯N hydrogen bond helps to establish the packing.

[(1R,3S)-6,7-Dimeth­oxy-1-phenyl-1,2,3,4-tetra­hydro­isoquinolin-3-yl]methanol 2.33-hydrate

The title compound, C18H21NO3·2.33H2O, is the fourth reported member in a series of (1R,3S)-6,7-dimethoxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline derivatives used in catalysis as ligands (or their precursors). The N-heterocycle in the structure adopts a half-chair conformation. The dihedral angle between the benzene rings is 77.29 (13)°. There are three ill-resolved water molecules of crystallization in the structure (one of them rotationally disordered about a threefold axis) involved in short contacts probably due to hydrogen bonding.

1,7-Dimethyl­penta­cyclo­[5.4.0.02,6.03,10.05,9]undecane-8,11-dione

The structure of the title compound, C13H14O2, a pentacycloundecane cage derivative, exhibits unusual Csp 3—Csp 3 single-bond lengths ranging from 1.505 (3) to 1.607 (2) Å and strained bond angles as small as 88.7 (1)° and as large as 121.0 (2)°. In this meso compound, an internal non-crystallographic mirror plane exists, bisecting the molecule. In the crystal, weak C—H⋯O hydrogen bonds link the molecules into an infinite spiral about a twofold screw axis along the [100] direction.

1,7-Dimethylpentacyclo[5.4.0.02,6.-03,10.05,9]undecane-8,11-dione

The structure of the title compound, C13H14O2, a pentacycloundecane cage derivative, exhibits unusual Csp 3—Csp 3 single-bond lengths ranging from 1.505 (3) to 1.607 (2) Å and strained bond angles as small as 88.7 (1)° and as large as 121.0 (2)°. In this meso compound, an internal non-crystallographic mirror plane exists, bisecting the molecule. In the crystal, weak C—H⋯O hydrogen bonds link the molecules into an infinite spiral about a twofold screw axis along the [100] direction.

1,7-Dimethyl-penta-cyclo-[5.4.0.0.0.0]undecane-8,11-dione.

The structure of the title compound, C13H14O2, a pentacycloundecane cage derivative, exhibits unusual Csp 3—Csp 3 single-bond lengths ranging from 1.505 (3) to 1.607 (2) Å and strained bond angles as small as 88.7 (1)° and as large as 121.0 (2)°. In this meso compound, an internal non-crystallographic mirror plane exists, bisecting the molecule. In the crystal, weak C—H⋯O hydrogen bonds link the molecules into an infinite spiral about a twofold screw axis along the [100] direction.