Hiromitsu Terao

Chloranthalactone F, A sesquiterpenoid from the leaves of Chloranthus glaber

Abstract From the leaves of Chloranthus glaber Makino, a new sesquiterpenoid, chloranthalactone F was isolated together with the known compounds, chloranthalactones A, B and E, atractylenolide II and (−)-4β,7α-dihydroxyaromadendrane. The structure of the new compound was elucidated by spectroscopic methods.

Orthosiphol D and E, minor diterpenes from Orthosiphon stamineus

Abstract From the aerial parts of Orthosiphon stamineus , two new diterpenes, orthosiphols D and E were isolated together with the known rosmarinic acid, sinensetin, scutellarein tetramethyl ether, salvigenin and orthosiphols A and B. The structures of the new compounds were elucidated mainly by spectroscopic methods.

Diterpenoids having ent-kaurene and ent-spiro-seco-kaurene skeletons from Rabdosia longituba

Abstract Two new diterpenoids, rabdokaurins A and B, together with the known compounds, lasiokaurin, effusanin B, macrophyllin B, rabdophyllin G and exidonin were isolated from the aerial parts of Rabdosia longituba . The structures of the new compounds have been determined on the basis of the spectroscopic and chemical evidence.

N-(2-Chlorophenyl)succinamic acid

The conformations of the N—H and C=O bonds in the amide segment of the structure of the title compound {systematic name: 3-[(2-chlorophenyl)aminocarbonyl]propionic acid}, C10H10ClNO3, are trans to each other, while the conformation of the amide H atom is syn to the ortho-chloro group in the benzene ring. Further, the conformations of the amide O atom and the carbonyl O atom of the ester segment are also trans to the H atoms attached to the adjacent C atoms. In the crystal structure, molecules are packed into infinite chains through intermolecular N—H⋯O and O—H⋯O hydrogen bonds.

Guanidinium tetra-bromidomercurate(II).

The Hg atoms in the crystal structure of the title compound, (CH6N3)2[HgBr4], are tetrahedrally coordinated by four Br atoms and the resulting [HgBr4]2− tetrahedral ions are linked to the [C(NH2)3]+ ions by bromine–hydrogen bonds, forming a three-dimensional network. In the structure, the anions are located on special positions. The two different Hg⋯Br distances of 2.664 (1) and 2.559 (1) Å observed in the tetrabromidomercurate unit are due to the connection of Br atoms to different number of H atoms.

3-[(3,5-Dichloro­anilino)carbon­yl]propionic acid

In the crystal structure of the title compound, C10H9Cl2NO3, the conformations of the amide O atom and the carbonyl O atom of the acid segment are anti to the H atoms of the adjacent –CH2 groups. The C=O and O—H bonds of the acid group are in relatively rare anti positions with respect to each other. This is an obvious consequence of the concerted effects of both the all-anti molecular conformation and the intermolecular hydrogen bond donated to the amide carbonyl group. In the crystal, molecules are packed into infinite chains through intermolecular N—H⋯O and O—H⋯O hydrogen bonds.

4-Methyl-N-phenyl-benzene-sulfonamide.

In the title compound, C13H13NO2S, the dihedral angle between the aromatic rings is 68.4 (1)°. In the crystal, the molecules are linked into inversion dimers by pairs of N—H⋯O hydrogen bonds. The unit cell of this compound was reported previously [Oh et al. (1985 ▶). Chung. Kwa. Yong. (Chung. J. Sci.), 12, 67] but no atomic coordinates were established in the earlier study.

N-(3,4-Dimethylphenyl)-4-methylbenzenesulfonamide

In the crystal structure of the title compound, C15H17NO2S, the conformations of the N—C bond in the C—SO2—NH—C segment are trans and gauche, respectively, with respect to the S=O bonds. The molecule is bent at the S atom with a C—SO2—NH—C torsion angle of −61.8 (2)°. Furthermore, the conformation of the N—H bond and the 3-methyl group in the aniline benzene ring are nearly anti to each other. The dihedral angle between the benzene rings is 47.8 (1)°. In the crystal, N—H⋯O hydrogen bonds link the molecules into chains.

2-Chloro-N-(3-chloro-phen-yl)acetamide.

The N—H bond in the title compound, C8H7Cl2NO, is anti to the meta-chloro substituent in the aromatic ring in both independent molecules comprising the asymmetric unit. The C=O bond is anti to the N—H bond and is also anti to the methylene H atoms. Intermolecular N—H⋯O hydrogen bonds link the molecules into supramolecular chains.

Crystal Structure and Phase Transition of 4-Aminopyridinium Tetrabromoantimonate(III) as Studied by Bromine and Antimony NQR, Proton NMR, and Single Crystal X-Ray Diffraction

The crystal structure of the room temperature phase (RTP) of the title compound was determined at 297 K (monoclinic, space group C2/c, a = 1384.2(2), b = 1377.8(3), c = 755.5(2) pm, β = 121.58(1)°). A complicated disorder was found for the cation. A phase transition from the low-temperature phase (LTP) to the RTP was found at (224 ±1) K (Tc). The 1H NMR spectra showed a sharp motional narrowing at ca. T=Tc , indicating the occurrence of a reorientational motion of the cation in the RTP in accord with the disorder. It was found that another reorientational motion is excited in the LTP. Four 81Br NQR lines (132.71, 115.38, 61.54 and 59.31 MHz at 77 K) and two Sb NQR lines (53.78 and 33.76 MHz at 77 K) were found in the LTP, while a single 81Br NQR line was observed at T> 276 K (ca. 121.80 MHz at 300 K). Crystal dynamics are discussed on the basis of the temperature dependence of the NQR, 1H NMR line width, and 1H NMR T1.