Oxidation of malic acid by vanadium (V) in sulphuric acid medium: A kinetic and mechanistic investigation

The oxidation kinetics of malic acid by vanadium(V) in aqueous sulphuric acid was investigated at 303 K by monitoring the appearance of vanadium(IV) at 760 nm. The reaction showed first-order behavior with respect to vanadium(V), malic acid, and hydrogen ion concentration, respectively, regardless of the ionic strength. The reaction rate is enhanced by an increase in ionic strength and a decrease of the dielectric constant of the medium by addition of methanol. The activation parameters were estimated by varying the temperature in the range of 293 K to 313 K to 313 K. An oxidation mechanism is proposed, involving different vanadium(V) species produced in the presence of sulphuric acid. © 1995 John Wiley & Sons, Inc.     

Synthesis of acetoxyacetaldehyde

Conclusions A method was developed for the preparation of acetoxyacetaldehyde (60% yield) by the hydrolysis of 1-ethoxy-1, 2-diacetoxyethane. Acetoxyacetaldehyde oligomerizes even at room temperature.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1630–1631, July, 1976.     

Polycyclic N-hetero compounds. XX. Synthesis of 11,13,15-triazasteroid with an alkyl group in the d-ring and an investigation of its antidepressive activity

11,13,15-Triazasteroidal skeleton with an alkyl group in the D-ring was synthesized and it was screened for antidepressive activity. Compounds VIIId and XIIa exhibited antireserpine action.     

Investigation on the possibility of cold nuclear fusion in Fe-Zr amorphous alloy

Neutron, and Mössbauer spectroscopy were used to study the possibility of cold nuclear fusion in Fe₉₀Zr₁₀ amorphous ribbon having high hydrogen absorbing ability. No significant changes in the neutron and in the spectra were found at deuterization performed electrochemically at different cathodic potentials. The observed differences between the Mössbauer spectra of samples deuterized in air and in nitrogen atmosphere can be explained by decrease of deuterium uptake as well as by a small heat effect due to reaction of hydrogen with oxygen dissolved in water in the case of electrolysis carried out in air.