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Related Concept Videos

Hydroboration-Oxidation of Alkenes03:08

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.
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
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...
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n + 2 rule.
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...

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Updated: Jun 11, 2026

Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants
08:56

Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants

Published on: March 25, 2017

Aromatic borozene.

N Gonzalez Szwacki1, V Weber, Cj Tymczak

  • 1Department of Physics, Texas Southern University, Houston, TX, 77004, USA. tymczakcj@tsu.edu.

Nanoscale Research Letters
|July 3, 2010
PubMed
Summary
This summary is machine-generated.

Researchers predict a new aromatic inorganic molecule, borozene (B12H6), with properties similar to benzene. This stable molecule exhibits unique magnetic properties and can form larger fused aromatic compounds.

Keywords:
Ab initioAromaticBoronBoron hydridesFreeONNICSPlanar molecules

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Small boron clusters have been extensively studied, providing a foundation for theoretical investigations.
  • Aromaticity in inorganic compounds is a key area of research, with benzene as a benchmark.
  • Understanding the properties of novel boron hydrides is crucial for developing new materials.

Purpose of the Study:

  • To theoretically predict the existence and properties of a novel inorganic molecule, B12H6 (borozene).
  • To compare the aromaticity and magnetic properties of borozene with those of benzene.
  • To explore the potential for fused borozene structures in creating advanced materials.

Main Methods:

  • Comprehensive theoretical investigation of boron clusters.
  • Quantum chemical calculations to determine molecular structure, stability, and electronic properties.
  • Analysis of magnetic susceptibility anisotropy.

Main Results:

  • Prediction of a stable, planar, aromatic inorganic molecule, borozene (B12H6), with D3h symmetry.
  • Borozene exhibits a large first excitation energy, similar to benzene.
  • Calculated magnetic susceptibility anisotropy of borozene is significantly larger than that of benzene.
  • Demonstration that fused borozene molecules can form larger aromatic systems with enhanced anisotropic susceptibilities.

Conclusions:

  • Borozene (B12H6) represents a novel class of aromatic inorganic molecules with benzene-like characteristics.
  • The unique magnetic properties of borozene and its fused derivatives offer potential for new applications.
  • This theoretical work opens avenues for experimental synthesis and exploration of borozene-based materials.