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Brønsted-Lowry Acids and Bases02:16

Brønsted-Lowry Acids and Bases

In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

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.
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...
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Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...

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Determination of the Gas-phase Acidities of Oligopeptides
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Las olefinas internas a las aminas lineales.

A Seayad1, M Ahmed, H Klein

  • 1Institut für Organische Katalyseforschung an der Universität Rostock e.V. (IfOK), Buchbinderstrasse 5-6, D-18055 Rostock, Germany.

Science (New York, N.Y.)
|September 7, 2002
PubMed
Resumen

Este estudio presenta un método catalítico de una sola olla para sintetizar selectivamente aminas lineales de las olefinas internas. El proceso utiliza ligandos especializados de fosfina y catalizadores de rodio para una síntesis química eficiente y ecológica.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • La catálisis de la catálisis.
  • Química verde es la química verde.

Sus antecedentes:

  • Las aminas lineales son bloques de construcción cruciales en los productos farmacéuticos y la ciencia de los materiales.
  • Los métodos de síntesis actuales a menudo carecen de selectividad o implican condiciones duras.
  • El desarrollo de rutas eficientes y sostenibles para las aminas lineales es un desafío continuo.

Objetivo del estudio:

  • Desarrollar un nuevo método catalítico de un solo bote para la síntesis selectiva de aminas lineales.
  • Para utilizar olefinas internas o mezclas de olefinas como materiales de partida.
  • Establecer una vía de síntesis económicamente atractiva y favorable para el medio ambiente.

Principales métodos:

  • Una secuencia de reacción catalítica de una sola olla que incluye la isomerización de olefinas, la hidroformilación y la aminación reductiva.
  • El uso de ligandos de fosfina especialmente diseñados en conjunto con catalizadores de rodio.
  • Optimización de las condiciones de reacción para una alta selectividad y rendimiento.

Principales resultados:

  • Síntesis selectiva exitosa de aminas lineales a partir de olefinas internas y mezclas de olefinas.
  • Demostrando el papel clave de los ligandos de fosfina y catalizadores de rodio a medida.
  • Logró un proceso económicamente viable y ambientalmente benigno para la producción de aminas.

Conclusiones:

  • El sistema catalítico de una sola olla desarrollado ofrece una ruta eficiente a las aminas alifáticas lineales.
  • Este método proporciona una alternativa sostenible a las estrategias sintéticas existentes.
  • El uso de ligandos y catalizadores específicos es fundamental para lograr una alta selectividad y una economía de proceso favorable.