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Videos de Conceptos Relacionados

Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Cycloalkanes02:28

Cycloalkanes

Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
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...
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,...

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Published on: February 7, 2019

Un silenileno acíclico de dos coordenadas estable y estable.

Andrey V Protchenko1, Krishna Hassomal Birjkumar, Deepak Dange

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK.

Journal of the American Chemical Society
|March 27, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron un silileno estable y aislable, un compuesto reactivo de silicio. Este avance permite nuevos estudios sobre la química y la reactividad del silileno, previamente limitados por la inestabilidad.

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Área de la Ciencia:

  • Química del organosilicio Química del organosilicio
  • Grupo Principal Elementos de la Química de los Elementos
  • Intermedios reactivos y reactivos.

Sus antecedentes:

  • Los sililenos acíclicos de dos coordenadas (SiR2) son típicamente transitorios o térmicamente inestables.
  • Las investigaciones anteriores se han centrado en los intermediarios transitorios de silileno.

Objetivo del estudio:

  • Para sintetizar y aislar una especie de silileno monomérico estable.
  • Para investigar la reactividad y las propiedades electrónicas de este nuevo silene.

Principales métodos:

  • Utilizó fuertes sustitutos sigma-donantes y estéricamente obstaculizados B ((NDippCH) 2).
  • Sintetizó las especies monoméricas de silileno Si{B(NDippCH) 2}{N(SiMe3) Dipp}.

Principales resultados:

  • El silileno sintetizado es estable en estado sólido hasta 130 °C.
  • Exhibe una fácil adición oxidativa con enlaces dihidrógeno y alquilo C-H.
  • Posee una baja brecha singlet-triplete (103,9 kJ mol(-1)).

Conclusiones:

  • Demuestra modos de reactividad fundamentales previamente observados en sistemas de metales de transición.
  • Abre nuevas vías para explorar la química y las aplicaciones del silileno.
  • Destaca el papel de los sustituyentes específicos en la estabilización de las especies reactivas.