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

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Дәйексөз келтіру

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Аннотация

The process of rearrangement of the octadecahydroeicosaborate anion [trans-B20H18]2– → [iso-B20H18]2– in various solvents (acetonitrile, DMF, DMSO) under UV irradiation in dynamics has been studied using 11B NMR spectroscopy. 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, 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 and it has been shown that an increase in the reaction time and an increase in the temperature of the reaction solution is accompanied by degradation of the boron cluster.

Толық мәтін

Рұқсат жабық

Авторлар туралы

O. Dontsova

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571

E. Matveev

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov; Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571; Moscow, 119991

E. Eshtukova-Shcheglova

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571

A. Nichugovskii

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571

A. Golubev

Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119991

V. Privalov

Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119991

V. Avdeeva

Kurnakov Institute of General and Inorganic Chemistry

Хат алмасуға жауапты Автор.
Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119991

E. Malinina

Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119991

K. Zhizhin

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov; Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571; Moscow, 119991

N. Kuznetsov

MIREA — Russian Technological University, Institute of Fine Chemical Technologies named after M.V. Lomonosov; Kurnakov Institute of General and Inorganic Chemistry

Email: avdeeva.varvara@mail.ru
Ресей, Moscow, 119571; Moscow, 119991

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2. Fig. 1. 11B{1H} NMR spectra of a reaction solution demonstrating the process of rearrangement of the [B20H18]2-anion from trans to iso in time to CH3CN.

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3. Fig. 2. 11B{1H} NMR spectra of the reaction solution demonstrating the process of rearrangement of the anion [B20H18]2– from trans to iso in time in DMFA.

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4. Fig. 3. 11B{1H} NMR spectra of the reaction solution demonstrating the process of rearrangement of the anion [B20H18]2- from trans to iso in time in DMSO.

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5. Fig. 4. Graph of the process of transition of the anion [B20H18]2– from the trans isomer to iso.

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6. Fig. 5. 11B{1H} NMR spectra of the reaction solution demonstrating the process of rearrangement of the [B20H18]2- anion from iso to trans with an increase in temperature in DMFA. The signal at +22 m.d., marked *, corresponds to the appearance of borates in the reaction solution.

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7. Scheme 1. Hawthorne rearrangement under UV irradiation.

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8. Scheme 2. Reverse Hawthorne rearrangement under the influence of temperature.

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9. Supplement
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