СИНТЕЗ И ИССЛЕДОВАНИЕ ХИМИЧЕСКИХ ТРАНСФОРМАЦИЙ BHC-(N,N)-ФУРФУРИЛСУЛЬФОНАМИДОВ НА ПРИМЕРЕ РЕАКЦИИ ДИЛЬСА-АЛЬДЕРА С ГЕКСАФТОРБУТИНОМ-2

The Diels-Alder reaction is widely used in organic synthesis due to its simplicity, reproducibility and high atom economy. The phenomenon of thermodynamic and kinetic control is unique in organic, chemistry since it allows alteration the direction of the reaction pathway by varying temperature. In this study we tried to obtain and characterize new sulfonylamides. The Diels-Alder reaction, between hexafluorobutyne-2 and initial sulfonylamides were conducted in order to estimate the electronic and steric influence on reaction rate and expand the class of available dienophiles in the Diels-Alder reaction, to perform kinetic and thermodynamic control.В результате данной работы были синтезированы не описанные ранее бис-№(фурил-2)-4-В-сулъфонамиды, а также проведено исследование их взаимодействия, с гексафторбутином-2, выделение аддуктов кинетического и термодинамического контроля данной реакции, с их последующей физико-химической характеристикой, в том числе методом РСА. Соответствующие «пинцет»- и «домино»-аддукты являются перспективными для исследования галоген-галогенных контактов в монокристаллах соединений, ввиду наличия значительного количества атомов фтора в целевых продуктах. Также полученные аддукты представляют интерес в качестве потенциально биологически активных соединений. В результате исследования были разработаны новые синтетические методики, а полученные соединения были полностью охарактеризованы совокупностью спектральных данных, в том числе, с помощью рентгеноструктурного анализа; в дальнейшем планируется провести испытания всех полученных аддуктов на микробиологическую активность

SOME CONSIDERATIONS ON THE ROLE OF ACIDITY IN OUR LIFE

A brief history of the concept of acidity is given and analyzed, including the development of acid-base theories. A key role of acid-base interaction in the environment is demonstrated. The most essential environmental threats caused by acid contamination are shown and parsed. The mechanistic origin of acid rains and ocean acidification is revealed, as well as the connection of these phenomena with the abnormal level of acidity in the environment

SYNTHESIS AND CRYSTAL STRUCTURE OF THE DIRHODIUM TETRAACETATE-DI(CYCLOHEXYLISOCYANIDE) COMPLEX

Abstract: Dirhodium acetate di(cyclohexylisocyanide) [Rh2(O2CCH3)4(C≡NCy)2] is prepared by treating Rh2(OAc)4 with cyclohexylisocyanide. The crystal structure of [Rh2(O2CCH3)4(C≡NCy)2] is determined by a single crystal X-ray diffraction (XRD) analysis. The title compound crystallizes in the orthorhombic system (space group Ibam). According to the single crystal XRD analysis data, the Rh atom exhibits a slightly distorted octahedral coordination geometry. The Rh1–Rh1–C1 fragment is almost linear (177.87°); ORhO angles are 88.28°, 88.79°, and 91.25°. In addition, the structure of the title compound is unambiguously confirmed by the aggregation of elemental analysis (C, H, N), ESI+–MS, and IR spectroscopy data. [Figure not available: see fulltext.]. © 2021, Pleiades Publishing, Ltd

Aurophilic Interactions in Cationic Three-Coordinate Gold(I) Bipyridyl/Isocyanide Complex

Gold(I) isocyanide complexes featuring Au---Au interactions attract considerable attention because of their tunable photophysical properties. Although the synthetic exploration of isocyanide gold(I) complexes seems reasonable, their structural diversity is mainly limited to linear gold(I) derivatives. The synthesis and structural characterization of cationic three-coordinate gold(I) mixed 22-bipyridyl/isocyanide complex are presented here for the first time. Cationic gold species form supramolecular dimers in the solid state via attractive Au---Au interactions. The nature and energies of aurophilic contacts, which are responsible for dimerization in the solid state, were studied by DFT calculations together with QTAIM, ELF, RDG, and NCI techniques and Hirshfeld surface analysis. The estimated energy of the aurophilic interactions was 6.3 kcal/mol. © 2022 by the authors. Licensee MDPI, Basel, Switzerland

Exploring Supramolecular Assembly Space of Cationic 1,2,4-Selenodiazoles: Effect of the Substituent at the Carbon Atom and Anions

Chalcogenodiazoles have been intensively studied in recent years in the context of their supramolecular chemistry. In contrast, the newly discovered cationic 1,2,4-selenodiazole supramolecular building blocks, which can be obtained via coupling between 2-pyridylselenyl halides and nitriles, are virtually unexplored. A significant advantage of the latter is their facile structural tenability via the variation of nitriles, which could allow a fine tuning of their self-assembly in the solid state. Here, we explore the influence of the substituent (which derives from the nitrile) and counterions on the supramolecular assembly of cationic 1,2,4-selenodiazoles via chalcogen bonding. © 2022 by the authors. Licensee MDPI, Basel, Switzerland