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Videos de Conceptos Relacionados

Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Stereoisomers02:32

Stereoisomers

On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:

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El control de los centros estereogénicos más allá de la tetracoordinación.

Anton Budeev1, Christof Sparr1

  • 1Department of Chemistry, University of Basel St. Johanns-Ring 19 Basel 4056 Switzerland christof.sparr@unibas.ch.

Chemical science
|February 20, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los centros estereogénicos penta y hexacoordinados ofrecen un complejo estereoisomerismo más allá de la doble estereogenicidad tradicional. Esta revisión explora su síntesis y aplicaciones en diversos campos como la química medicinal y la catálisis.

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Área de la Ciencia:

  • La estereoquímica es la estereoquímica.
  • Química de grupos principales y metales de transición.

Sus antecedentes:

  • Los centros estereogénicos convencionales suelen ser tetracoordinados con doble estereogenicidad.
  • Los centros estereogénicos penta y hexacoordinados exhiben un estereoisomerismo más complejo, expandiendo el espacio estereoquímico accesible.
  • Este complejo estereoisomerismo se observa en el grupo principal y en los compuestos de metales de transición con ligandos específicos.

Objetivo del estudio:

  • Resumir los fundamentos de la estereogenicidad de orden superior en los centros estereogénicos penta y hexacoordinados.
  • Proporcionar una visión general de las aplicaciones emergentes para estos complejos estereoisómeros.
  • Discutir las estrategias de síntesis estereoselectiva para compuestos con centros estereogénicos de orden superior.

Principales métodos:

  • Revisión de la literatura centrada en la estereoquímica de los centros de penta y hexacoordenadas.
  • Análisis del estereoisomerismo en el grupo principal y los complejos de metales de transición.
  • Exploración de metodologías sintéticas para la síntesis estereoselectiva.

Principales resultados:

  • Los centros de penta y hexacoordenadas pueden codificar múltiples estereoisómeros, a diferencia de los centros tetracoordenados.
  • Este complejo estereoisomerismo prevalece en varios compuestos de metales de grupo principal y de transición.
  • El campo de la síntesis estereoselectiva para estos centros está poco explorado, pero tiene un potencial significativo.

Conclusiones:

  • La estereogenicidad de orden superior en los centros de penta y hexacoordenadas ofrece mayores posibilidades estereoquímicas.
  • Estos centros tienen aplicaciones prospectivas en química medicinal, catálisis y ciencias de la información.
  • Se justifica una mayor exploración de su síntesis estereoselectiva para desbloquear todo su potencial.