MECHANISMS OF TRANSMISSION OF THE SPIN-SPIN INTERACTION OF CARBON-CARBON IN A SERIES OF BICYCLOBUTANE DERIVATIVES

Within the framework of the self-consistent theory of finite perturbations SCPT INDO, the calculation of the spin-spin interaction constants 13C-13C with preliminary optimization of geometric parameters in 17 bicyclo derivatives is carried out[1.1.0.] of Bhutan. There is a good correspondence of the calculated constants with the experimental values known in the literature and measured in this work. Based on the results of the calculations performed, the study of hybridization effects in the considered series of compounds was carried out. All bicyclobutane derivatives are characterized by an abnormally low s-character of endocyclic hybrid orbitals forming a bond between bridging carbon atoms. Substitution effects have a weak effect on the s-order of the bridge connection. The presence of an unsaturated alcohol structure in the 2-position of the bicyclo-butane fragment leads to a sharp decrease in the s-character of the endocyclic hybrid orbitals of the bridged carbon atoms.

Heck Transformations of Biological Compounds Catalyzed by Phosphine-Free Palladium

The development and optimization of synthetic methods leading to functionalized biologically active compounds is described. Two alternative pathways based on Heck-type reactions, employing iodobenzene or phenylboronic acid, were elaborated for the arylation of eugenol and estragole. Cinnamyl alcohol was efficiently transformed to saturated arylated aldehydes in reaction with iodobenzene using the tandem arylation/isomerization sequential process. The arylation of cinnamyl alcohol with phenylboronic acid mainly gave unsaturated alcohol, while the yield of saturated aldehyde was much lower. Catalytic reactions were carried out using simple, phosphine-free palladium precursors and water as a cosolvent, following green chemistry rules as much as possible.

PROTECTIVE PROPERTIES OF «SOLING» SERIES INHIBITORS IN ACIDIC MEDIA CONTAINING HYDROGEN SULPHIDE

The work presents the results of the study of a number of inhibitory compositions of the “Soling” series based on acetylenic alcohols and their mixtures with nitrogen-containing compounds of various types in a hydrochloric acid (0.1 M HCl) containing 100 ppm of hydrogen sulphide. Gravimetric tests and electrochemical studies were performed on mild steel St3 at ambient temperature. The exposure time of the samples was 24 h. Polarization curves were obtained in a three-electrode cell, using the SOLARTRON 1280 C electrochemical measuring complex. The following protective compositions were studied: Soling IK-1 on the basis of unsaturated alcohol in a mixture with sulfur-containing amide in an aqueous medium; Soling IK-2 on the basis of unsaturated alcohol with additions of quaternary ammonium salt and complexone; Soling IK-3 on the basis of unsaturated alcohol in the system of organic solvents, as well as Soling IK-4(A) on the basis of a high-molecular nitrogen-containing surfactant (molecular weight from 300 to 400) with additions of unsaturated alcohol in a system of organic solvents and Soling IR-4(B) based on a high-molecular nitrogen-containing surfactant with a molecular weight of up to 300. It has been obtained that the use of unsaturated alcohols without additives in the presence of hydrogen sulphide is possible only at sufficiently high concentrations. At low concentrations, the corrosion process is markedly stimulated (composition IK-3). In a mixture with nitrogen-containing compounds (compositions IK-1, IK-2, IK-4(A)) it is possible to achieve high protective effect allowing the use of these compositions for hydrogen sulfide-containing media. The most effective are the compositions IK-2 and IK-4(A), for which the protective effect reaches the values of 97 and 90%, respectively, and also these compositions in the whole range of concentrations studied eliminate the appearance of hydrogen blistering. In most cases, the studied compositions are characterized by effective inhibition of the partial cathodic process. For SolIng IK-2 inhibition of the partial anodic reaction is clearly expressed.Forcitation:Menshikov I.A., Shein A.B. Protective properties of «Soling» series inhibitors in acidic media containing hydrogen sulphide. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 90-97

The superior performance of a Pt catalyst supported on nanoporous SiC–C composites for liquid-phase selective hydrogenation of cinnamaldehyde

The Pt/SiC–C catalyst: active, selective (80% selectivity to unsaturated alcohol) and reusable for liquid-phase hydrogenation of cinnamaldehyde at room temperature.

Geometric effect of Ru/HSAG@mSiO2: a catalyst for selective hydrogenation of cinnamaldehyde

The geometric effect of covered mesoporous silica layers enhances the terminal hydrogenation of cinnamaldehyde to unsaturated alcohol.