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Related Concept Videos

Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Halogenation of Alkenes02:46

Halogenation of Alkenes

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.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

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Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Emerging subject for chiral separation science: cluster boron compounds.

Hana Horáková1, Bohumír Grüner, Radim Vespalec

  • 1Institute of Environmental Chemistry, Faculty of Chemistry, Brno Technical University, Brno, Czech Republic.

Chirality
|March 9, 2011
PubMed
Summary

Chiral boron clusters show different separation behaviors than organic compounds. Current rules for organic chiral separations do not apply to boron clusters, requiring further research.

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Area of Science:

  • Analytical Chemistry
  • Stereochemistry
  • Boron Chemistry

Background:

  • Structural chirality is a key feature of synthetic boron cluster compounds, potentially influencing biochemical effects.
  • Chiral separations are crucial for understanding and utilizing chiral molecules in various scientific fields.

Purpose of the Study:

  • To investigate the chiral separability of boron cluster compounds using cyclodextrins as chiral selectors.
  • To compare the chiral separation characteristics of boron clusters with those of organic species.
  • To highlight the need for new methodologies for boron cluster chiral separation.

Main Methods:

  • High-Performance Liquid Chromatography (HPLC) was employed for zwitter-ionic cluster boron compounds.
  • Electrophoretic studies were conducted for boron cluster anions.
  • Uncharged cyclodextrins were utilized as chiral selectors in both methods.

Main Results:

  • Boron cluster compounds exhibit significantly different chiral separability compared to organic species when using uncharged cyclodextrins.
  • Analytical characteristics of chiral separations for boron clusters and organic species show marked differences.
  • Existing rules for organic chiral separations are not directly applicable to boron cluster chiral separations.

Conclusions:

  • The unique chiral separation behavior of boron clusters necessitates experimental verification of separation rules.
  • The limited research on boron cluster chirality hinders the explanation of observed separation phenomena.
  • Further investigation is required to understand the particularities and effects in boron cluster chiral separations with cyclodextrins.