Table of contents

The methods of preparation and properties of phosphorus ylids containing fluorine atoms in the "alkylidene" component are considered with the exception of halogenomethylenephosphoranes and ylids which contain fluorine atoms only at an appreciable distance from the carbanionic centre. The bibliography includes 87 references.

We shall review the discovery of this element, studies of its chemical nature, and modern ideas on its chemical and physical properties. Possible chemical and nuclear-chemical methods of synthesising new radon compounds and of determining their properties and their identity will be discussed, using information published up to May 1980. 121 references.

The literature data on the complex formation reactions involving the SeCN groups in aqueous and non-aqueous solutions are surveyed. The syntheses and properties of metal selenocyanate coordination compounds are described. The bibliography includes 156 references.

The reactions of fluorine and its compounds under plasma conditions are discussed. 145 references.

The present state of research into the photochemical reactions of bilirubin in various media is examined. Data are presented on certain physical, chemical, and physicochemical properties of bilirubin. Attention is specially concentrated on photodynamic decomposition processes and photoisomerisation of bilirubin. The data are discussed in connection with the urgent problem of the use of light in the treatment of hyperbilirubinemia in children. The bibliography includes 85 references.

The present state of the theory of the elementary step in flotation as a multistage process is surveyed. The characteristics of the flotation of small particles both in the stage where they approach the bubble and in the stage involving their fixation to the surface of the bubble are described. It is shown that the deposition of small particles (in contrast to large particles) on the surface of the bubble takes place without inertia and is not accompanied by a significant deformation of the surface. The usefulness of the application of ionogenic surfactants in order to overcome or modify the sign of the disjoining pressure of electrical double layers, which is the commonest factor hindering the flotation of small particles, is demonstrated. The possible ways of intensifying the flotation of submicron particles by their aggregation are analysed. The bibliography includes 99 references.

Data on the kinetics and mechanism of the oxidation of aliphatic amines by various oxidants are surveyed and examined critically. The bibliography includes 205 references.

A systematic account is given of data on the molecular geometries of approximately 300 nitro-compounds obtained for the vapours by gas electron diffraction and microwave spectroscopy and for the crystalline phases by X-ray diffraction. Certain rules have been formulated for the variation of the geometrical parameters of the molecules in the principal classes of nitrocompounds: inorganic, aliphatic, alicyclic, and aromatic nitro-compounds, nitroamines, and salts and complexes of nitroalkanes and aromatic nitro-compounds. The bibliography includes 181 references.