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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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...
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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the...
8.6K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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...
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Newman Projections02:06

Newman Projections

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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

11.4K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Related Experiment Video

Updated: May 3, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Toward the peri-pentacene framework.

Lukas Zöphel, Reinhard Berger, Peng Gao

    Chemistry (Weinheim an Der Bergstrasse, Germany)
    |February 6, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a new synthesis for peri-pentacene precursors using pyrene chemistry. The stable tetraketone derivatives offer a pathway to explore the electronic properties of this complex aromatic framework.

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    Area of Science:

    • Organic Chemistry
    • Materials Science
    • Supramolecular Chemistry

    Background:

    • The peri-pentacene framework is of significant interest due to its extended aromatic system.
    • The inherent instability and reactivity of fully aromatic peri-pentacene necessitate the synthesis of stable precursors.
    • Pyrene chemistry provides a versatile platform for constructing complex polycyclic aromatic hydrocarbons.

    Purpose of the Study:

    • To develop a novel synthetic route towards stable peri-pentacene precursors.
    • To synthesize and characterize planar and dragonfly-shaped tetraketone derivatives of peri-pentacene.
    • To investigate the properties and potential for further functionalization of these novel compounds.

    Main Methods:

    • Utilized a 4,5,9,10-tetrafunctionalization of pyrene as a key step.
    • Synthesized planar and dragonfly-shaped tetraketone derivatives in a five-step process.
    • Characterized compounds using Nuclear Magnetic Resonance (NMR) spectroscopy, UV/Vis spectroscopy, cyclic voltammetry, Electron Spin Resonance (ESR) spectroscopy, and MALDI-TOF Mass Spectrometry (MS).

    Main Results:

    • Successfully synthesized two distinct peri-pentacene tetraketone derivatives.
    • The dragonfly-shaped derivative exhibited excellent organosolubility, unlike the planar form which required strong acids.
    • NMR studies revealed the presence of atropo-isomers in the dragonfly-shaped derivative.
    • Stepwise reduction confirmed the formation of the radical anion, indicating potential for further conjugation.

    Conclusions:

    • A new synthetic strategy for accessing peri-pentacene precursors has been established.
    • The dragonfly-shaped derivative offers a promising, soluble platform for studying peri-pentacene chemistry.
    • The successful reduction to the radical anion opens avenues for exploring the electronic and optical properties of related conjugated systems.