Cooxidation of Chalcones and Oxalic acid using Chromium (VI)

Chalcones can be easily oxidized in presence of oxalic acid, by Cr(VI) in acetic acid medium, the rate of cooxidation was found to be a fractional order with respect to the chalcones and its substituents. The order with respect to the chromic acid is unity whereas order with respect to oxalic acid is also a fractional order. The effect of various parameters such as [H+], [NaCl], [NaNO3] and dielectric constant of the medium by changing the (v/v) ratio of acetic acid and water content were studied .The intermediate is formed between chalcones and a chromic aci

Treatment of Sewer Water Using Alum Salt

This investigation was carried out to study the effect of addition o

Twisting and planarization in push-pull ethylenes

As determined by X-ray crystallography, Meldrum's acid derivatives 8–19 feature dihedral angles around the central CC double bonds between 3 and 83°. Hydrogen bonds between substituents RHN and the carbonyl groups favour near-planarity. Sterically demanding substituents favour large dihedral angles and zwitterionic structures as in formula 20. AM1 calculations of the structures are in excellent agreement with the experimental X-ray data, provided a dielectric field is incorporated (?= 40). This can be ascribed to the highly polar (zwitterionic) nature of the molecules. It is further predicted that all these molecules, including those that are stabilised in a planar form by intramolecular hydrogen bonds, undergo rapid rotation about the central CC bonds at room temperature. DFT calculations incorporating a dielectric field model (PCM) are in excellent agreement with the near-perpendicular arrangement of the alkene moiety in 19