関連する実験動画

Updated: Jul 12, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
08:43

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

Published on: January 19, 2016

メチルクロロフォーム:平流圏オゾンに与える影響

J C McConnell, H I Schiff

    Science (New York, N.Y.)
    |January 13, 1978
    PubMed
    まとめ

    規制により,トリクロロエチレンの代替品であるメチルクロロフォームの使用が促進されました. メチルクロロフォームムの大気への放出は,オゾン層の大幅な破壊につながり,オゾン層の大幅な破壊は,クロロフルオロメタンによって引き起こされるものの約20%を占める.

    さらに関連する動画

    Analysis of Volatile and Oxidation Sensitive Compounds Using a Cold Inlet System and Electron Impact Mass Spectrometry05:48

    Analysis of Volatile and Oxidation Sensitive Compounds Using a Cold Inlet System and Electron Impact Mass Spectrometry

    Published on: September 5, 2014

    Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate04:17

    Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate

    Published on: January 20, 2023

    関連する概念動画

    Multiple Halogenation of Methyl Ketones: Haloform Reaction01:28

    Multiple Halogenation of Methyl Ketones: Haloform Reaction

    A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic acyl substitution.
    Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

    Radical Substitution: Halogenation of Alkanes and Alkyl Substituents

    In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
    In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
    Mass Spectrometry: Alkyl Halide Fragmentation01:22

    Mass Spectrometry: Alkyl Halide Fragmentation

    Chlorine isotopes exist as 35Cl and 37Cl in a 3:1 ratio, while bromine isotopes exist as 79Br and 81Br in a 1:1 ratio. The mass spectrum of alkyl halides typically produces two distinct molecular ion peaks, the molecular ion peak, [M], and the molecular ion plus two, [M + 2] peak. The relative heights of these two peaks are proportional to the isotopic abundance ratios of the halide. For example, 2‐chloropropane and 1‐bromopropane display two peaks with relative peak heights in a 3:1 and 1:1...
    Microbes and Climate Change01:27

    Microbes and Climate Change

    Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
    Oxidative Cleavage of Alkenes: Ozonolysis01:46

    Oxidative Cleavage of Alkenes: Ozonolysis

    In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
    Ozone is a symmetrical bent molecule stabilized by a resonance structure.
    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.