[en] Mass spectrometry study on asymmetrical and symmetrical derivatives of mercurated carboranes-12 was performed. Main ways of fragmentation of carboranylmercurohalogenides 9-C₂H₁₁B₁₀HgHal and mercury biscarboranyls (9-C₂H₁₁B₁₀)₂Hg and (C₂H₁₁B₁₀C^-)₂Hg under electron shock have been established. Strength of Hg-B and Hg-C bonds increases on transition from o- to m- and p-isomers and Hg-B bond is more strength as compared with Hg_Hal bond. It is shown that carboranyl ions undergo no dehydration practically while this process proceeds intensively in ions containing no mercury atoms

[en] Interaction of η⁵- indenyltricarbonyl rhenium complex with acetylchloride at the presence of AlCl₃ is studied. It is shown that η⁵-C₉H₇R(CO)₃ acetylation takes place only in a 6-member ring of π-ligand and it is accompanied by metal-π-ligand bond break. A probable mechanism of the reaction is considered

[en] In order to elucidate the mechanism of the dehydrogenation process using as an example o-carborane, the authors study the dependence of the ratio of the sum of the intensities of dehydrogenated ions vs the intensities of the molecular ions (pounds(M-nH)+/M+), characterizing the degree of dehydrogenation, on the energy of the ionizing electrons at the temperature of the ionization chamber and the temperature of the insertion system. Under electron impact conditions, dehydrogenation is the main fragmentation process of isomeric carboranes. The progress of this process enhances with the increase of the energy of ionizing electrons and the temperature of the ionization chamber

[en] The paper describes the synthesis and the physicochemical properties of chromium tricarbonyl- and tungsten tricarbonyl-dimethylsulphonium-cyclopentadienylide. It presents the mass spectroscopic resolution scheme for complexes of this type, using a tungsten complex as an example. The physicochemical properties of the complexes obtained are discussed. (T.D.)