The biotransformation of 13α,17-dihydroxystemodane (3) with the fungus Cephalosporium aphidicola afforded 13α,17,18-trihydroxystemodane (4), 3β,13α,17-tri-hydroxystemodane (5), 13α,17-dihydroxy-stemodan-18-oic acid (6), 3β,11β,13α,17-tetra-hydroxystemodane (7), 11β,13α,17,18-tetrahydroxystemodane (8) and 3β,13α,17,18-tetra-hydroxystemodane (9). The hydroxylation at C-18 of the substrate points ...

The -SCH(2)CH(2)CH(2)CH(2)S- portion of the title compound, C(12)H(14)N(2)S(2), adopts an extended zigzag conformation. The angles at the tetra-hedral carbon atoms are marginally increased [113.63 (12)° and 111.38 (17)° for S-C-C and C-C-C respectively] from the idealized tetra-hedral angle. The mol-ecule lies on an inversion center located at the mid-point of the butyl chain. In the crystal, t...

The title compound, C(26)H(28)N(2)O(9)·1.5H(2)O, the product of an acid-catalysed Wagner-Meerwein skeletal rearrangement, crystallizes as a sesquihydrate with the O atom of one of the two independent water mol-ecules occupying a special position on a twofold axis. The organic mol-ecule comprises a fused penta-cyclic system containing two five-membered rings (cyclo-pentane and tetra-hydro-furan)...

In the title compound, C(8)H(5)F(4)NO(2), synthesized by esterification of 2,3,4,5-tetra-fluoro-anthranilic acid with methanol, an intra-molecular amine N-H⋯O(carbon-yl) hydrogen bond is present, while inter-molecular N-H⋯O hydrogen bonds produce chains in the crystal, which extend along the b-axis direction.

Enantioselective intramolecular conjugate addition reactions of short-lived C-O axially chiral enolates have been developed. The reactions proceeded with inversion of the configuration and provided dihydrobenzofurans with contiguous tetra- and trisubstituted carbon centers in up to 96% enantiomeric excess (ee).

Leaves and roots are used as hepatic tonic rejuvenates hair, cirrhosis, ear aches, hepatitis, headache and enlarged spleen. Studies on the hepatoprotective activity on methanolic extract and sub fractions of leaves and the chloroform extract and sub fractions of roots of Eclipta alba was carried out using carbon tetrachlorideinduced liver damage and Lysosomal enzymes level in wistar albino rats...

The 1-(2,3,4,5,10,20,30,40-octamethylferrocen-1-yl)-3-(ruthenocenyl)allylium cation readily undergoes one-electron oxidation to a dication in which an octamethylferrocenium moiety is bridged by a vinylene group to a [( -fulvene)( -cyclopentadienyl)ruthenium] moiety. In the title compound, 1-(2,3,4,5,10,20,30,40-octamethylferrocen-1-yl)-3-(ruthenocenylidene)prop-1-enium(2+) bis(tetra ̄uoroborate)...

The title compound, C(31)H(38)O(10) [systematic name: (αR,4R,4aR,6aS,7R,8S,10R,11S)-methyl α,10-di-acet-oxy-4-(3-furyl)-4a,7,9,9-tetra-methyl-2,13-dioxo-1,4,4a,5,6,6a,7,8,9,10,11,12-dodeca-hydro-7,11-methano-2H-cyclo-octa-[f][2]benzo-pyran-8-acetate], was isolated from the seeds of Swietenia macrophylla. The mol-ecule contains four six-membered rings connected together in the shape of a bowl; o...

Fullerene C60 films deposited by sublimation were irradiated with Kr-F laser in a wide fluence interval from 15 to 40 mJ/cm2. In situ photoacoustic analysis was applied to study the phase transformation during the irradiation. The results obtained were discussed in conjunction with atomic force microscopy (AFM) and Raman spectroscopy data. It was found that for a irradiation fluence interval fr...

The title compound, C(16)H(16)O(7), isolated from Kaempferia rotunda rhizomes, features a six-membered cyclo-hexane ring that adopts a twisted-boat conformation owing to the presence of two adjacent epoxide attachments that lock in four of the six axial positions. The CH(3)CO(2)- and HO- substituents occupy equatorial positions. However, the bond angles at the ring carbon connected to the C(6)H...