Related Experiment Video

Updated: Jun 5, 2026

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
04:38

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions

Published on: July 28, 2022

1,1'-Dimethyl-1,1'-(butane-1,4-di-yl)dipyrrolidinium dibromide methanol disolvate

Yu-Lin Yang, Wen-Jiu Wang, Wen-Hui Li

    Acta Crystallographica. Section E, Structure Reports Online
    |January 5, 2011
    PubMed

    More Related Videos

    Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties10:16

    Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

    Published on: January 8, 2016

    Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers08:12

    Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

    Published on: December 16, 2022

    Related Concept Videos

    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.
    Formation of Halohydrin from Alkenes02:41

    Formation of Halohydrin from Alkenes

    An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
    Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

    Carboxylic Acids to Methylesters: Alkylation using Diazomethane

    Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
    Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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

    The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
    Halogenation of Alkenes02:46

    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.
    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...