Oxidation rate of saturated hydrocarbons by permanganate in aqueous solutions

Conclusions The reaction for the oxidation of alkanes in aqueous permanganate solutions is first order in both substrate and oxidizing agent. The reaction rate constants were measured for a number of C₃-C₇ normal, iso-, and cycloalkanes. The normal type of selectivity is fulfilled: the tertiary C-H bonds are more active, while the primary C-H bonds are less active than the secondary C-H bonds.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1654–1656, July, 1982.     

Effect of a permeable partition on convective instability of a horizontal liquid layer

We consider the effect of a thin permeable partition on the static stability of a horizontal liquid layer heated from underneath. The permeable partition is assumed to be plane and situated parallel to the boundary planes in the center of the layer. The resistance of the partition to the flow of liquid from one part of the layer to another leads to an increase in the static stability. We investigate the dependence of the minimum critical Rayleigh number-on the resistance of the partition and the form of the critical motions.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 157–159, January–February, 1977.     

Preparation of 2,2′-octahydrodithienyl and its complexes with HgCl2 and CdCl2

Conclusions The ionic hydrogenation of 2,2-dithienyl with triethylsilane and trifluoroacetic acid gave 2,2-octahydrodithienyl, which was characterized by its complexes with HgCl₂ (II) and CdCl₂ (II).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1173–1174, May, 1976.     

Proton chemical polarisation,autocatalysis and frontal kinetics of the oxidation of dialkylsulphides with nitric acid

The oxidation of dimethyl sulphide to dimethylsulphoxide with nitric acid displays CIDNP effects of protons and the phenomenon of frontal kinetics. The process is autocatalytic, with N₂O₄ as the catalyst and the primary oxidant of sulphide. In the presence of the inhibitor (methylmercaptan) the frontal reaction takes place: in purified samples—the usual volume reaction. The interaction of ethyl, n-propyl and n-butyl sulphides with NO₂ is accompanied by integral polarisation of the α-CH₂-protons. In all the cases sulphide is negatively polarised and sulphoxide positively polarised. The reaction mechanism proposed includes the formation of a radical pair during the interaction of sulphide with N₂O₄. Disproportionation of the radical pair leads to the formation of polarised sulphoxide and the decay results in re-generation of sulphide. The rate of oxidation of sulphide during the volume reaction is proportional to the product polarisation.