(5-n-Hexyl-2-hydroxymethyl-1,3-dioxan-2-yl)methanol

In the title compound, C12H24O4, the dioxane ring adopts a chair conformation; the n-hexyl chain, which occupies an equatorial position, has an extended zigzag conformation. In the crystal, mol­ecules are connected by O—H⋯O hydrogen-bonds into a zigzag chain running along the b axis, giving rise to a herringbone pattern

Perillartine

The chiral title compound [systematic name: 4-(1-methyl­vinyl)cyclo­hexene-1-carbaldehyde oxime], C10H15NO, crystallizes with two mol­ecules in the asymmetric unit, one of which shows disorder of its propenyl substituent over two sets of sites in a 50:50 ratio. In both mol­ecules, the six-membered carbaldehyde oxime ring adopts an approximate envelope conformation in which the C atom bearing the propenyl substituent represents the flap position. In both mol­ecules, the plane passing through the propenyl substituent is nearly perpendicular to the mean plane of the six-membered ring [dihedral angles = 84.6 (6) and 87.4 (3)°]. In the crystal, the two independent mol­ecules are linked by a pair O—H⋯N hydrogen bonds across a pseudo-inversion centre, generating a dimer. The unit cell of the known racemate of the title compound is similar to the cell found here, but with space group P

(5-n-Heptyl-2-hydroxymethyl-1,3-dioxan-2-yl)methanol

In the title compound, C13H26O4, the dioxane rings adopts a chair conformation; the n-heptyl chain occupies an equatorial position. In the crystal, mol­ecules are connected by O—H⋯O hydrogen bonds into a zigzag chain running along the a axis, giving rise to a herringbone pattern. There are two independent mol­ecules in the asymmetric unit

7,11,18,21-Tetra­oxatrispiro­[5.2.2.5.2.2]heneicosa­ne

The four six-membered rings all adopt chair conformations in the two independent mol­ecules of the title cyclo­hexa­none cyclic diacetal with penta­erythritol, C17H28O4

(Benzoato-κ2 O,O′)(5,5,7,12,12,14-hexa­methyl-1,4,8,11-tetra­azacyclo­tetra­decane-κ4 N,N′,N′′,N′′′)nickel(II) perchlorate monohydrate

The Ni atom in the title salt, [Ni(C7H5O2)(C16H36N4)]ClO4·H2O, is in a six-coordinate octa­hedral geometry. The metal atom is chelated by the carboxyl­ate group, and the macrocyclic ligand adopts a folded configuration. The cation, anion and water mol­ecules engage in hydrogen bonding to form a layer structure

The unique rapid variabilities of the iron Kα\alpha line profiles in NGC 4151

We present a detailed analysis of the iron K$\alpha$ line variabilities in NGC 4151 by using long ASCA observation data obtained in May 1995. Despite the relatively small amplitude variations in the continuum flux, the iron K$\alpha$ line flux and profile show dramatic variations. Particularly, the line profile changes from single peak to seeming double peaks and back in time scales of a few 10$^4$ sec. The seemingly double-peaked profiles can be well interpreted as line emission from a Keplerian ring around a massive black hole. An absorption line at around 5.9 keV is also marginnaly detected. We discussed current Fe K line models, but none of them can well explain the observed line and continuum variations.Comment: 18 pages, latex, 3 figures, ApJ accepte

2-(4-Amino­phen­yl)-1,3-benzoxazole

In the title mol­ecule, C13H10N2O, the dihedral angle between the benzoxazole ring system and the benzene ring is 11.8 (1)°. In the crystal structure, mol­ecules are linked by inter­molecular N—H⋯N hydrogen bonds and π⋯π inter­actions [centroid–centroid distance = 3.6560 (15) Å] to form a two-dimensional network

5,5-Bis(hydroxy­meth­yl)-2-phenyl-1,3-dioxane

In the title compound, C12H16O4, the 1,3-dioxane ring adopts a chair conformation; the 2-phenyl substitutent occupies an equatorial position. Adjacent mol­ecules are linked by O—H⋯O hydrogen bonds into a chain