Noncatalytic Bromination of Icosahedral Dicarboranes: The Key Role of Anionic Bromine Clusters Facilitating Br Atom Insertion into the B–H σ-Bond
作者:Andrey V. Shernyukov、George E. Salnikov、Dmitry A. Rudakov、Alexander M. Genaev
DOI:10.1021/acs.inorgchem.0c03392
日期:2021.3.1
theoretically. We found that the reactions of o- and m-carboranes 1 and 2 with elemental bromine are first order in the substrate but unusually high (approximately fifth) order in bromine. The calculated energy barriers of these reactions decrease sharply as more bromine molecules are added to the quantum-chemical system. A considerable primary deuterium kinetic isotopeeffect for the bromination of 2 indicates
Synthesis of 9,9´,12,12´-substituted cobalt bis(dicarbollide) derivatives
作者:S. A. Anufriev、I. B. Sivaev、V. I. Bregadze
DOI:10.1007/s11172-015-0924-4
日期:2015.3
A partial degradation of 9,12-disubstituted derivatives of ortho-carboranes 9,12-X2-1,2-C2B10H10 (X = Br, Alk, Ar) led to the corresponding substituted nido-carboranes [5,6-X2-7,8-C2B9H10]–, which on the reaction with cobalt(II) chloride gave new 9,9´,12,12´-tetrasubstituted derivatives of cobalt bis(dicarbollide) [9,9´,12,12´-X4-3,3´-Co(1,2-C2B9H9)2]–.
Quantitative Assessment of Substitution NMR Effects in the Model Series of <i>o</i>-Carborane Derivatives: α-Shift Correlation Method
作者:Bohumil Štíbr、Oleg L. Tok、Josef Holub
DOI:10.1021/acs.inorgchem.7b01023
日期:2017.7.17
The principles of a new α-shift correlation (ASC) NMR method are demonstrated on a model series of substituted derivatives of o-carborane for which reliable NMR data are available. This graphical method revealed an acceptable linear correlation between α(11B) or α(13C) shifts and those induced by substituents in unsubstituted (u) positions of the carborane cluster. The linearity holds for all nuclei