Phytochemical investigations of the ethanolic extract of the seeds of Rhus coriaria L. (Anacardiaceae) led to the identification of four new xanthones, characterized as 2,3-dihydroxy-7-methyl xanthone (1), 2,3,6-trihydroxy-7-hydroxymethylene xanthone-1-carboxylic acid (2), 2-methoxy-4-hydroxy-7-methyl-3-O-beta-D-glucopyranosyl xanthone-1,8-dicarboxylic acid (4), and 2-hydroxy-7-hydroxymethylene...

In previous studies, we observed decreased uptake of 14C-labeled L-aspartate and L-glutamate in s.c. transplants of several rapidly growing hepatomas relative to that in normal liver. The present report extends these observations to isolated cells and indicates that circulation differences cannot be the major factor. Mean net uptakes for the two dicarboxylic amino acids in cells from the rapidl...

The Lewis acid-mediated reactions of allene-ene compounds, derived from 3-methylcitronellal or dimethyl malonate, were carried out using various Lewis acids such as ethylaluminum dichloride, diethylaluminum chloride, titanium chloride, zinc chloride etherate, or boron trifluoride etherate, affording unexpectedly intramolecular [2+2]cycloaddition products under some particular reaction condition...

Lignin depolymerization through peroxide oxidation produces dicarboxylic acids (DCA), especially C4-DCA, like succinic acid. In this work, the effect of methoxy substituents on C4-DCA production using lignin model compounds (p-hydroxybenzoic acid, vanillic and syringic acid) hardwood softwood samples was studied. It concluded that increased reactivity toward oxidation. The acid yield higher for...

The gas-liquid chromatography of 2-chloroethyl derivatives of short- and long-chain monocarboxylic acids, and of short-chain dicarboxylic acids and aldehydes has been studied with a dual-flame ionization detector that provided simultaneous records of the concentrations of chlorine and of total organic material in the column effluent. The chloroethyl derivatives of dicarboxylic acids and aldehyd...

A systematic investigation on electronic band structure of a series of isoreticular metal−organic frameworks (IRMOFs) using density functional theory has been carried out. Our results show that halogen atoms can be used as functional groups to tune not only the band gap but also the valence band maximum (VBM) in MOFs. Among halogen atoms (F, Cl, Br, I), iodine is the best candidate to reduce th...