Study of the Reversible Hawthorne Rearrangement between Isomeric Forms of the Octadecahydroeicosaborate Anion Using Dynamic ¹¹B NMR Spectroscopy

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发表日期：

2024年3月28日

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O. S. Dontsova,
E. Yu. Matveev,
E. A. Eshtukova-Shcheglova,
A. I. Nichugovskii,
A. V. Golubev,
V. I. Privalov,
V. V. Avdeeva,
E. A. Malinina,
K. Yu. Zhizhin,
N. T. Kuznetsov

摘要

Abstract

The process of rearrangement of the octadecahydroeicosaborate anion [trans-B₂₀H₁₈]^2– → [iso-B₂₀H₁₈]^2– in organic solvents (acetonitrile, DMF, DMSO) under UV irradiation has been studied using ¹¹B NMR spectroscopy in dynamics. It has been shown that the time of complete isomeric transition depends on the solvent used. In acetonitrile, complete conversion of the [trans-B₂₀H₁₈]^2– anion to the iso form is achieved in 1 h; in DMF, the process takes about 2 h; in DMSO, it takes about 3 h. The reverse process of rearrangement of the macropolyhedral borohydride anion [iso-B₂₀H₁₈]^2– → [trans-B₂₀H₁₈]^2– has been studied under the influence of temperature in DMF; it has been shown that an increase in the reaction time and temperature of the reaction solution is accompanied by degradation of the boron cluster.

Study of the Reversible Hawthorne Rearrangement between Isomeric Forms of the Octadecahydroeicosaborate Anion Using Dynamic 11B NMR Spectroscopy

摘要

Study of the Reversible Hawthorne Rearrangement between Isomeric Forms of the Octadecahydroeicosaborate Anion Using Dynamic ¹¹B NMR Spectroscopy