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Carboxylic Acids to Acid Chlorides

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Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Radical Substitution: Allylic Chlorination01:31

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Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

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In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
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Reactions at the Benzylic Position: Halogenation01:11

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Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
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Palau'chlor: un reactivo de cloración práctico y reactivo.

Rodrigo A Rodriguez1, Chung-Mao Pan, Yuki Yabe

  • 1Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
|April 25, 2014
PubMed
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Un nuevo reactivo de cloración a base de guanidina, CBMG ("Palau

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química sintética de la química sintética.

Sus antecedentes:

  • Las arenas cloradas y las (hetero) arenas son valiosas para ajustar las propiedades electrónicas y permitir la diversificación a través de reacciones de acoplamiento cruzado.
  • Los métodos de cloración existentes pueden carecer de eficiencia, seguridad o un amplio alcance de sustrato.

Objetivo del estudio:

  • Desarrollar un nuevo, eficiente y seguro reactivo de cloración para la síntesis orgánica.
  • Para introducir CBMG ("Palau'chlor"), un reactivo a base de guanidina para la cloración.

Principales métodos:

  • Desarrollo de un nuevo reactivo clorante a base de guanidina, CBMG.
  • Probar la compatibilidad del reactivo con varios sustratos, incluidos los heterociclos que contienen nitrógeno, los arenos, los sistemas π conjugados, las sulfonamidas y los éteres de sililenoles.
  • Análisis comparativo con los reactivos clorantes existentes.

Principales resultados:

  • El CBMG ("Palau'chlor") fue sintetizado con éxito y demostrado como un agente clorante eficaz.
  • El reactivo exhibe una cloración leve, directa, operacionalmente simple y segura.
  • Se observó una amplia compatibilidad de sustrato a través de diversas moléculas orgánicas.
  • El CBMG superó a otros reactivos clorantes conocidos en estudios comparativos.

Conclusiones:

  • CBMG ("Palau'chlor") representa un avance significativo en la metodología de cloración.
  • Este nuevo reactivo ofrece una alternativa superior para la introducción de átomos de cloro en moléculas orgánicas.
  • Su versatilidad y perfil de seguridad lo convierten en una herramienta valiosa para los químicos sintéticos.