Crystal Structures and Physicochemical Properties of 3-Chloro-4-hydroxyphenylacetic Acid Salts with Amines.

3-chloro-4-hydroxyphenylacetic acid (CHPAA) is a fungal metabolite. It is a small molecule that is useful in crystal engineering studies due to the functional groups present. Six amines were selected to form salts with CHPAA.

Antimycobacterial, Cytotoxic, and Antioxidant Activities of Abietane Diterpenoids Isolated from .

Medicinal plants of the genus (Lamiaceae) are well known for their ethnomedicinal applications. , which is native to South Africa, is traditionally used in the treatment of respiratory conditions, scabies, and cutaneous wounds. The phytochemical studies of led to the isolation of five known royleanone abietanes, namely, 6β,7α-dihydroxyroyleanone (), 7α-acetoxy-6β-hydroxyroyleanone (), horminone (), coleon U quinone (), and carnosolon ().

Organic Salts of -Coumaric Acid and -Ferulic Acid with Aminopicolines.

-Coumaric acid (CA) and -ferulic acid (TFA) were co-crystallised with 2-amino-4-picoline (2A4MP) and 2-amino-6-picoline (2A6MP) producing organic salts of (CA)(2A4MP) (), (CA )(2A6MP) () and (TFA )(2A4MP)·( 3 2 HO) (). For salt , water was included in the crystal structure fulfilling a bridging role. CA formed a 1:1 salt with 2A4MP (' = 1) and a 4:4 salt with 2A6MP (' = 4).

Functional characteristics of Bambara groundnut starch-catechin complex formed using cyclodextrins as initiators.

Bambara groundnut (BGN) starch extracted from BGN flour was modified through complexation methods using alpha and beta cyclodextrin. Complexation methods used included the microwave, co-evaporation and kneading methods. Cyclodextrin (alpha and beta) were used as initiators for grafting catechin to the BGN starch molecule.

Salts of Mefenamic Acid With Amines: Structure, Thermal Stability, Desolvation, and Solubility.

Salt formation has been known to improve some physicochemical properties of active pharmaceutical ingredients particularly solubility. In this study, mefenamic acid (MA) formed salts with ethylenediamine (EDM), triethylamine (TA), 1-methylpiperazine (MP), and morpholine (MOP). In the salt structures studied, the proton of the carboxylic acid group of the MA molecule was transferred to a nitrogen atom of the amine.

Solvates of selected fenamic acids with substituted pyridines: structure, thermal stability and desolvation.

Mefenamic acid (MA) formed solvates with 2-picoline (2PIC), 3-picoline (3PIC), 4-picoline (4PIC) and 3-chloropyridine (3CLPYR). The solvates crystallized in the space group P\bar 1 with the carboxylic acid of MA hydrogen-bonded to the nitrogen of the substituted pyridine. Tolfenamic acid (TFA) formed solvates with 2PIC and 3PIC, the crystal structures successfully solved in the space groups P2/n and Pbca, respectively.

9-Meth-oxy-9-(2-meth-oxy-phen-yl)-9H-xanthene.

In the title compound, C(21)H(18)O(3), the xanthene system and the meth-oxy-phenyl ring are practically orthogonal with a dihedral angle between their mean planes of 89.27 (3)°. The meth-oxy group attached to the phenyl ring makes a C-O-C-C torsion angle of 11.

Inclusion of volatile guests by a tetrapedal host: structure and kinetics.

The host compound tetra(3-hydroxy-3,3-diphenyl-2-propynyl)ethene, TET, forms inclusion compounds with acetone, dimethyl sulfoxide, dioxane and pyridine. All the structures were successfully solved in the triclinic space group P1[combining macron]. We found variable host : guest ratios for the acetone (TET.

Xanthenol clathrates: structure, thermal stability, guest exchange and kinetics of desolvation.

A series of clathrates comprising the xanthenol host, 9-(4-methoxyphenyl)-9H-xanthen-9-ol, with a variety of aromatic guests displays similar structures in the space group P(-1). We have elucidated the structures of the inclusion compounds H x 1/2G, where H is 9-(4-methoxyphenyl)-9H-xanthen-9-ol and G is benzene, o-, m- and p-xylene. The structures are isostructural with respect to the host and display consistent (Host)-OH.

Desorption kinetics of a xanthenol-dioxane clathrate.

The host xanthenol compound forms a 1:1 clathrate with dioxane, namely 9-(1-naphthyl)-9H-xanthen-9-ol-1,4-dioxane, C23H16O2.C4H8O2. The structure of this clathrate is reported, along with a study of the kinetics of desolvation and the determination of an activation energy.