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In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
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Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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A Second Modification of Beryllium Bromide: β-BeBr2.

Magnus R Buchner1, Fabian Dankert2, Nils Spang1

  • 1Fachbereich Chemie, Philipps-Universität Marburg, Marburg 35032, Germany.

Inorganic Chemistry
|November 13, 2020
PubMed
Summary

Researchers synthesized a new beryllium bromide (β-BeBr2) phase by recrystallizing α-BeBr2. This novel material was characterized using X-ray diffraction, spectroscopy, and computational methods for comparison with related beryllium halides.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • Beryllium halides (BeCl2, BeBr2, BeI2) exhibit complex structural chemistry.
  • Understanding different crystalline modifications is crucial for predicting material properties.

Purpose of the Study:

  • To synthesize and characterize a new phase of beryllium bromide, designated β-BeBr2.
  • To compare the structural and spectroscopic properties of β-BeBr2 with its known α-BeBr2 phase and other beryllium halides.

Main Methods:

  • Recrystallization of α-BeBr2 from benzene with cyclo-decamethylpentasiloxane.
  • Single-crystal X-ray diffraction for structural determination.
  • Infrared (IR) and Raman spectroscopy for vibrational analysis.
  • Density Functional Theory (DFT) calculations for theoretical insights.

Main Results:

  • Successful synthesis and isolation of the β-BeBr2 phase.
  • Detailed structural data obtained from single-crystal X-ray diffraction.
  • Spectroscopic signatures (IR and Raman) characteristic of the new phase.
  • Comparison of structural and electronic properties with α-BeBr2 and other beryllium halides.

Conclusions:

  • The synthesis of β-BeBr2 expands the known structural diversity of beryllium bromide.
  • The combined experimental and computational approach provides a comprehensive understanding of this new material.
  • This study contributes to the fundamental knowledge of beryllium halide chemistry.