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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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NMR Spectroscopy of Benzene Derivatives01:37

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Una historia del iodabenceno

Abdel Monem Rawashdeh1, Priyakumari Chakkingal Parambil2, Tao Zeng3

  • 1Department of Chemistry, Yarmouk University , Irbid 211-63, Jordan.

Journal of the American Chemical Society
|May 3, 2017
PubMed
Resumen

Los investigadores identificaron una nueva molécula de iodabenceno "parecida a un pájaro". El análisis computacional sugiere que esta estructura inusual es lo suficientemente estable como para una posible detección y aislamiento experimental.

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Área de la Ciencia:

  • * Química computacional
  • * Química orgánica
  • * Estudios de aromatización

Sus antecedentes:

  • * Las moléculas aromáticas planas con 8 electrones π son inestables.
  • * Los complejos de Meisenheimer ofrecen un precedente para estabilizar estructuras electrónicas inusuales.
  • * El iodabenceno es una molécula cíclica (CH) 5I con potencial para configuraciones electrónicas únicas.

Objetivo del estudio:

  • * Investigar la estructura electrónica y la estabilidad de un isómero de iodabenceno no plano.
  • * Explorar estrategias de estabilización para sistemas de electrones π inusuales.
  • * Evaluar la viabilidad de sintetizar y detectar la estructura de iodabenceno propuesta.

Principales métodos:

  • * Se utilizaron cálculos basados en la teoría de la función de densidad (DFT).
  • * Se analizaron la estructura electrónica y la distribución de la carga.
  • * Se calcularon las vías de reacción y las barreras de activación.

Principales resultados:

  • * Un movimiento estable y no plano
  • como un pájaro
  • El isómero de iodabenceno fue identificado computacionalmente.
  • * Esta estructura exhibe propiedades electrónicas análogas a los complejos de Meisenheimer.
  • * La sustitución con receptores π puede estabilizar aún más la molécula.
  • * Existe una barrera energética significativa para la conversión a una estructura clásica de 5-iodociclopentadieno.

Conclusiones:

  • * Las barreras de estabilidad y reacción calculadas apoyan la posible existencia del isómero de iodabenceno similar al de las aves.
  • * Los hallazgos sugieren que la detección y el aislamiento experimental de esta nueva molécula pueden ser alcanzables.
  • * Este trabajo amplía la comprensión de la aromaticidad y la estabilización en moléculas orgánicas.