Video Experimental Relacionado

Updated: May 21, 2026

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

Published on: May 15, 2015

Aislamiento a temperatura ambiente de un compuesto con un enlace triple boro-boro

Holger Braunschweig¹, Rian D Dewhurst, Kai Hammond

¹Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@uni-wuerzburg.de

Science (New York, N.Y.)

|June 16, 2012

Resumen

Los investigadores sintetizaron un compuesto de triple enlace de boro-boro estable, una diborina. Este avance abre nuevas vías en la química de los grupos principales, que anteriormente se limitaba a unos pocos elementos.

Área de la Ciencia:

Química de los grupos principales.
Química inorgánica y inorgánica.
Química del organoboron en su composición.

Sus antecedentes:

Los enlaces triples homoatómicos son raros en los elementos del grupo principal, se observan principalmente en los alquinos y el dinitrógeno.
Los esfuerzos anteriores para sintetizar bonos triples de boro-boro estables no han tenido éxito.

Objetivo del estudio:

Para sintetizar y caracterizar un compuesto estable con un enlace triple boro-boro.
Para ampliar los ejemplos conocidos de enlace múltiple en elementos del grupo principal.

Principales métodos:

Reducción de un tetrabromodiborano estabilizado bis (N-heterocíclico) utilizando naftalenuro de sodio.
Caracterización cristalográfica y espectroscópica de los compuestos resultantes.

Principales resultados:

Aislamiento de compuestos estables de diboreno y diboreno.
Confirmación de un diborino lineal libre de haluros que contiene un enlace triple boro-boro.

Conclusiones:

Se logra la síntesis de un enlace triple boro-boro estable.
Este hallazgo desafía las limitaciones anteriores en la vinculación múltiple del grupo principal.

Más Videos Relacionados

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Published on: November 30, 2022

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Published on: March 27, 2018

Videos de Conceptos Relacionados

Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.

Hybridization of Atomic Orbitals I

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

Halogenation of Alkenes

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

Radical Substitution: Allylic Bromination

Radical Substitution: Allylic Bromination

In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...

Exceptions to the Octet Rule

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories: