Related Experiment Video

Updated: May 19, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

(1S,3R,8R)-2,2-Dibromo-3,7,7,10-tetra-methyl-tricyclo-[6.4.0.0(1,3)]dodec-9-ene

Ahmed Benharref, Lahcen El Ammari, Essêdiya Lassaba

    Acta Crystallographica. Section E, Structure Reports Online
    |August 21, 2012
    PubMed

    More Related Videos

    Preparation of Carbon Nanosheets at Room Temperature10:44

    Preparation of Carbon Nanosheets at Room Temperature

    Published on: March 8, 2016

    Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core08:51

    Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

    Published on: October 24, 2017

    Related Concept Videos

    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...
    Structure of Conjugated Dienes01:16

    Structure of Conjugated Dienes

    Introduction
    Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
    Disubstituted Cyclohexanes: cis-trans Isomerism02:37

    Disubstituted Cyclohexanes: cis-trans Isomerism

    Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
    In cyclohexane, the substituents can occupy different positions generating distinct isomers.
    [4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

    [4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

    The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
    Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

    Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

    Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
    π Molecular Orbitals of 1,3-Butadiene01:24

    π Molecular Orbitals of 1,3-Butadiene

    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 number...