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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
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...
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.
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Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

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El ciclopropilhidroxicarbeno y el ciclopropilhidroxicarbeno.

David Ley1, Dennis Gerbig, J Philipp Wagner

  • 1Justus-Liebig University, Heinrich-Buff-Ring 58, 35392 Giessen, Germany.

Journal of the American Chemical Society
|July 29, 2011
PubMed
Resumen
Este resumen es generado por máquina.

El ciclopropilhidroxicarbeno, una nueva molécula, exhibe una vida media significativamente prolongada debido a su grupo ciclopropilo. Esta estabilización se atribuye a sus capacidades de donante π y al comportamiento de túnel [1,2]H observado.

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Área de la Ciencia:

  • Química Física es la química física.
  • Química orgánica es la química orgánica.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Los carbenos son intermediarios altamente reactivos cruciales en la síntesis orgánica.
  • Los hidroxicarbenos son una clase específica de carbenos con propiedades electrónicas únicas.
  • Comprender la estabilidad y la reactividad de los carbenos es clave para controlar las transformaciones químicas.

Objetivo del estudio:

  • Para sintetizar y caracterizar el ciclopropilhidroxicarbeno.
  • Investigar la reactividad y la estabilidad del ciclopropilhidroxicarbeno, en particular su comportamiento en túneles.
  • Para dilucidar el papel del sustituto ciclopropilo en la modulación de las propiedades de los carbenos.

Principales métodos:

  • Pirólisis flash en alto vacío del ácido ciclopropilglyoxílico a 960 °C.
  • El aislamiento de la matriz en argón sólido a 11 K.
  • Espectroscopia infrarroja (IR) para la caracterización.
  • Estudios de fotólisis para observar las reacciones del carbeno.
  • Química computacional (CCSD) y el formalismo de Wentzel-Kramers-Brillouin para el análisis de túneles.

Principales resultados:

  • El ciclopropilhidroxicarbeno fue generado y caracterizado con éxito.
  • Tras la fotólisis, el carbeno se sometió a una expansión de anillo a ciclobut-1-en-1-ol, un nuevo compuesto.
  • El ciclopropilhidroxicarbeno aislado en la matriz exhibió [1,2] túnel de H, produciendo ciclopropilcarboxaldehído.
  • El grupo ciclopropilo aumentó significativamente la vida media del carbeno (τ = 17,8 h a 11-20 K) en comparación con el hidroximetileno progenitor, atribuido a los efectos del π-donante.
  • El análogo O-deutero confirmó la ausencia de túnel en esa configuración.

Conclusiones:

  • El ciclopropilhidroxicarbeno es el primer hidroxicarbeno con una vida media significativamente prolongada.
  • La capacidad de donante π de la fracción ciclopropilo es un factor dominante en la estabilización de los hidroxicarbenos.
  • Las capacidades de los donantes electrónicos de los sustituyentes son fundamentales para determinar la vida media de los hidroxicarbenos.